Music Licensing Question - Amazon seller copying my product listing

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Illustrative scenario prepared by my practice.
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Hypothetical question

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

Amazon seller copying my product listing. I've been dealing with this for about 11 weeks now and the situation isn't improving.

This involves software/code I developed over the past 27 months. I do not have documentation proving my ownership and timeline.

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