Photography / Image Rights - company using my music without sync license

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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.

company using my music without sync license. I've been dealing with this for about 5 weeks now and the situation isn't improving.

This involves software/code I developed over the past 6 months. I do have documentation proving my ownership and timeline.

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