Brand Name / Business Name Conflict | company using my music without sync license

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Illustrative scenario prepared by my practice.
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Hypothetical question

Fwiw i've been trying to resolve this on my own but I'm stuck.

company using my music without sync license. I've been dealing with this for about 8 months now and the situation isn't improving.

This involves original creative work over the past 18 months. I do not have documentation proving my ownership and timeline.

Should I hire a lawyer for this or try to handle it myself?