Subject: URGENT - Critical Defect in [Software Name] - Demand for Immediate Resolution [Vendor Company] [Support/Legal Department] [Address] Re: Contract #[number] - Material Breach Due to Critical Software Defect Dear [Vendor Contact]: This letter constitutes formal notice of a critical defect in [Software/Module Name] (Version [X]) deployed in our production environment, causing substantial business losses. DEFECT DESCRIPTION: • Software Component: [specific module/feature] • Version/Build: [number] • Deployment Date: [date] • Defect Discovered: [date and time] • Error Description: [specific behavior - e.g., "database transaction rollback failure causing data corruption"] • Severity: Critical (P0) - production system down IMPACT ON OUR BUSINESS: • System downtime: [X] hours from [start time] to [end time] • Transactions affected: [number] (valued at $[amount]) • Customers impacted: [number] • Data integrity issues: [describe corruption/loss] • Estimated revenue loss: $[amount] • Emergency mitigation costs: $[amount] (third-party consultants, overtime) EVIDENCE OF DEFECT: Attached are: 1. System logs showing error messages (Exhibit A) 2. Screenshots of crashes/error states (Exhibit B) 3. Database integrity check results (Exhibit C) 4. Timeline of incidents (Exhibit D) Our technical team has confirmed this is NOT due to: • Misconfiguration on our end • Third-party integration issues • Infrastructure problems • User error The defect is reproducible and directly attributable to [Software Name] code. CONTRACTUAL VIOLATIONS: Per Software License Agreement dated [date]: 1. Section [X] - Express Warranty: "Software will perform substantially in accordance with Documentation" → Software fails core documented functionality 2. Section [Y] - SLA Guarantee: "99.9% uptime" → Actual uptime this month: [%] due to this defect 3. Section [Z] - Support Response Time: "P0 issues resolved within 4 hours" → Your team acknowledged issue [date] but has not provided fix as of [date] ([X] days later) DAMAGES INCURRED: • Direct Revenue Loss: $[amount] • Data Recovery Costs: $[amount] • Emergency Consulting Fees: $[amount] • Customer Credits/Refunds: $[amount] • Reputational Harm: [describe, difficult to quantify] TOTAL: $[AMOUNT] DEMANDS: 1. IMMEDIATE patch or hotfix (within 48 hours) 2. Root cause analysis and guarantee this won't recur 3. Compensation for damages: $[amount] 4. SLA credits per contract terms: $[amount] 5. Commitment to enhanced testing before future releases CURE PERIOD: Per Contract Section [X], you have [30] days from this notice to cure the breach. However, given the critical nature and ongoing losses, we require immediate action. If defect is not resolved by [DATE - 7 days], and compensation not agreed by [DATE - 30 days], we will: • Terminate the agreement for material breach • Demand full refund of license fees paid: $[amount] • Pursue damages in [arbitration/court per contract] • Seek preliminary injunction if you attempt to enforce non-compete or non-solicitation clauses We value our relationship but cannot continue to sustain losses due to defective software. Please treat this with utmost urgency. Contact our CTO [Name] at [email/phone] to coordinate immediate resolution. Sincerely, [Your Name] [Title] [Company] cc: [Your Attorney if retained]

Subject: Notice of Material Breach - Failure to Deliver Contracted Functionality [Developer/Vendor Company] [Project Manager/CEO] [Address] Re: Software Development Agreement dated [DATE] - Breach of Contract Dear [Name]: [Client Company] ("Client") engaged [Developer Company] ("Developer") to create custom software per Statement of Work dated [DATE]. Developer has failed to deliver agreed functionality, constituting material breach. CONTRACT TERMS: • SOW dated: [date] • Total contract value: $[amount] • Paid to date: $[amount] • Delivery deadline: [date] • Acceptance criteria: [reference section of SOW] AGREED DELIVERABLES (per SOW Section [X]): 1. [Feature/Module 1 - specific description] 2. [Feature/Module 2 - specific description] 3. [Feature/Module 3 - specific description] [...continue list] ACTUAL DELIVERABLES - DEFICIENCIES: 1. [Feature 1]: NOT DELIVERED despite being in SOW • Contractual requirement: [quote SOW] • Current status: Missing entirely / Partially implemented / Non-functional 2. [Feature 2]: DOES NOT MEET SPECIFICATIONS • SOW requirement: [quote] • Actual implementation: [describe deviation] • Impact: Cannot be used for intended purpose 3. [Feature 3]: DELIVERED LATE (beyond cure period) • Due date per SOW: [date] • Actually delivered: [date] ([X] days late) ACCEPTANCE TESTING FAILURES: Per SOW Section [Y], software must pass User Acceptance Testing before final payment. Testing conducted [date] revealed: • [X] critical bugs (attached UAT report - Exhibit A) • [Y] features failed to meet acceptance criteria • Overall: SOFTWARE REJECTED per contract terms COMMUNICATION TIMELINE: • [DATE]: Initial delivery received, deficiencies noted • [DATE]: Email to Developer listing issues (Exhibit B) • [DATE]: Developer promised fixes by [date] - not delivered • [DATE]: Follow-up meeting - Developer requested extension • [DATE]: Extended deadline passed - still not compliant • [DATE]: This formal notice of breach FINANCIAL IMPACT: • Cannot launch product to customers (lost revenue: $[amount/month]) • Paid third-party consultant to assess code quality: $[amount] • Opportunity cost (delayed market entry): $[amount] • May need to hire different developer to complete: $[estimated amount] BREACH OF CONTRACT CLAIMS: 1. Failure to deliver all contracted deliverables 2. Delivered software does not meet specifications (breach of express warranty) 3. Missed deadlines without justification 4. Breach of implied warranty of workmanlike performance DEMANDS: Option 1 (Preferred): Complete the work properly • Fix all identified defects within 30 days • Implement missing features per SOW • Pass UAT per contract criteria • No additional charges to Client Option 2: Partial refund and contract termination • Refund $[amount] (proportionate to undelivered features) • Deliver all source code, documentation, and work product to date • Assign all IP rights to Client per contract Option 3: Full refund and rescission • Return all fees paid: $[total amount] • Mutual release of all claims • Client retains any work product created to date DEADLINE: [DATE - 15 days from letter] If you do not respond or cure by the above deadline, Client will: • Terminate agreement for cause (no further payment due) • Demand return of all funds paid • Seek damages for breach including consequential losses • File lawsuit in [jurisdiction per contract] • Report non-performance (may impact your future RFPs) We gave multiple opportunities to remedy. This is the final notice before legal action. Please respond by [DATE - 7 days] indicating which option you will pursue. Sincerely, [Your Name], [Title] [Company] Enclosures: - UAT Report (Exhibit A) - Email correspondence (Exhibit B) - SOW with redlines showing gaps (Exhibit C)

Subject: Notice of SLA Violations - Demand for Service Credits and Remediation [SaaS Provider] [Customer Success / Legal] [Address] Re: Account #[number] - Material SLA Breaches Dear [Provider]: [Client Company] subscribed to [SaaS Product] under Master Subscription Agreement dated [DATE]. Your service has repeatedly violated Service Level Agreement terms, causing significant business disruption. CONTRACT SLA COMMITMENTS (per Agreement Section [X]): • Uptime Guarantee: 99.95% per month • Maximum Unplanned Downtime: 21.6 minutes/month • Incident Response: Critical issues acknowledged within 1 hour • Resolution Time: P0 incidents resolved within 4 hours ACTUAL PERFORMANCE - VIOLATIONS: Month [Month/Year]: • Total downtime: [X] hours ([Y] minutes) • Uptime: [%] (BELOW guaranteed 99.95%) • Incidents: [list dates and durations] Month [Month/Year]: • Total downtime: [X] hours • Uptime: [%] • Incidents: [list] Month [Month/Year]: • Total downtime: [X] hours • Uptime: [%] • Incidents: [list] PATTERN OF FAILURES: This is not isolated. Over [X] months, you have failed SLA [Y] times. Common issues: • Database performance degradation during peak hours • API timeouts and 500 errors • Scheduled maintenance exceeding announced windows • Lack of advance notice for maintenance BUSINESS IMPACT: • Our customers cannot access services during outages • Lost transactions/orders: [number] valued at $[amount] • Customer complaints: [number] • Staff overtime to handle issues: $[cost] • Reputational damage (we resell your service to our customers) SUPPORT RESPONSE INADEQUATE: • Incident #[number] ([date]): Took [X] hours to acknowledge (SLA = 1 hour) • Incident #[number]: No resolution provided, issue resolved itself after [duration] • Your team repeatedly blames "network issues" without evidence • Root cause analyses promised but never delivered SLA CREDITS OWED (per Contract § [Y]): Per your own SLA terms: • [Month]: [%] downtime = [X]% credit = $[amount] • [Month]: [%] downtime = [X]% credit = $[amount] • [Month]: [%] downtime = [X]% credit = $[amount] TOTAL SLA CREDITS DUE: $[AMOUNT] ADDITIONAL DAMAGES BEYOND SLA CREDITS: • Lost revenue due to service unavailability: $[amount] • Customer refunds/credits we issued: $[amount] • Cost to implement backup/failover system: $[amount] DEMANDS: 1. Immediate issuance of SLA credits: $[amount] 2. Additional compensation for losses: $[amount] 3. Detailed root cause analysis for each major incident 4. Corrective action plan to prevent recurrence 5. Commitment to infrastructure upgrades (with timeline) 6. Option to terminate contract without penalty if SLA violated again in next 3 months DEADLINE: [DATE - 30 days] If SLA credits and remediation plan not received by above date: • We will exercise contract termination right per Section [Z] (termination for cause) • Demand pro-rata refund of prepaid subscription: $[amount] • Pursue damages for breach of contract • Public disclosure of service reliability issues (permitted under contract) • Escalate to [arbitration/litigation per agreement] Your SLA is not just marketing - it's a binding contractual commitment. We rely on your service for our business operations and cannot tolerate continued failures. Please respond by [DATE - 15 days] with: 1. Confirmation of SLA credits 2. Proposed remediation plan 3. Executive commitment to service improvements Sincerely, [Your Name], [Title] cc: Our legal counsel

Subject: URGENT - Data Loss Incident Due to Software Defect - Legal Notice [Software Vendor] [CEO / Legal Department] [Address] Re: Data Loss and Security Breach - Demand for Immediate Action and Compensation Dear [Vendor]: On [DATE], a critical defect in [Software Name] resulted in catastrophic data loss and potential security breach affecting [Client Company]'s systems and customer data. INCIDENT SUMMARY: • Date/Time: [timestamp] • Affected System: [software/module] • Root Cause: Software bug in [specific component] • Data Impacted: [describe - customer records, financial data, etc.] • Volume: [X] records / [Y] GB of data • Recovery Status: [partial/none/ongoing] SOFTWARE DEFECT IDENTIFIED: Your software version [X] contains a bug in [functionality] that caused: • [Technical description of bug] • Our forensic analysis confirms the defect originated in your code (report attached - Exhibit A) • This is NOT due to misconfiguration, user error, or third-party systems NEGLIGENCE BY VENDOR: • This bug was KNOWN to you (referenced in support ticket #[number] from [date]) but not disclosed to customers • No patch or security advisory issued • Inadequate testing before release (industry standard = [describe], you did not perform) CONTRACTUAL BREACHES: 1. Breach of Express Warranty (Agreement § [X]) "Software will maintain data integrity and security" 2. Breach of Implied Warranty of Merchantability Software not fit for basic purpose (data storage/protection) 3. Negligent Coding / Professional Malpractice Failed to meet industry standard of care for software development DATA BREACH REGULATORY IMPLICATIONS: This incident triggered obligations under: • GDPR (if EU persons affected): We must notify within 72 hours • CCPA (California customers) • [State] data breach notification law • HIPAA (if health data involved) Our legal and compliance costs to handle notifications and potential fines. DAMAGES INCURRED: • Data forensics and recovery attempts: $[amount] • Regulatory notification costs: $[amount] • Credit monitoring for affected customers: $[amount/person × number] • Expected regulatory fines: $[estimated] • Customer lawsuits (potential): $[exposure] • Business interruption: $[amount] • Reputational harm: [incalculable] TOTAL ESTIMATED DAMAGES: $[AMOUNT] IMMEDIATE DEMANDS: 1. Within 24 hours: • Acknowledge responsibility for the defect • Provide emergency patch or workaround • Technical resources to assist in data recovery 2. Within 7 days: • Comprehensive root cause analysis • Detailed forensic report on data exposure • List of all customers potentially affected by this bug 3. Within 30 days: • Payment of $[amount] for incurred costs • Commitment to cover regulatory fines and legal settlements • Agreement to fund customer notification and credit monitoring LEGAL CONSEQUENCES OF NON-COMPLIANCE: • Immediate lawsuit for negligence, breach of contract, breach of warranty • Seek punitive damages (gross negligence in failing to disclose known bug) • Report to relevant regulatory authorities • Public disclosure of incident and your role (we are legally required to notify affected parties) • Your limitation of liability clause likely UNENFORCEABLE given gross negligence We expect your immediate response and cooperation. This is a crisis requiring urgent action, not standard support ticket handling. Contact [Your CTO] at [phone] and [Your Legal Counsel] at [phone] immediately. Time is of the essence. [Your Name] [Title] cc: [State] Attorney General (Data Privacy Division) [Regulatory Body] Our Cyber Insurance Carrier Enclosures: - Forensic Analysis Report (Exhibit A) - Timeline of Incident (Exhibit B) - Support Ticket History Showing You Were Aware of Bug (Exhibit C)