Cap Table Question - convertible note maturity extension

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

Has anyone dealt with something like this? I'm not sure what my options are.

convertible note maturity extension. I've been dealing with this for about 9 months now and the situation isn't improving.

I have already consulted briefly with a lawyer but did not get a clear answer.

Do I have a strong case? What should my next steps be?