Illegal Lockout by Landlord | title issue discovered after closing

I publish illustrative scenarios prepared by my practice. All participants and conversations are fictional. The fictional posts are not posts by real users, accounts of client experiences, or reports of actual results.
Illustrative scenario prepared by my practice.
For informational purposes only. This is not legal advice. Laws vary by jurisdiction. Consult a qualified attorney for advice specific to your situation.
Hypothetical question

Quick background on my situation — any input appreciated.

title issue discovered after closing. I've been dealing with this for about 11 weeks now and the situation isn't improving.

I have been renting for 1 years. My monthly rent is $2,677. I have a written lease.

What are my legal options here? Is it worth pursuing?