Has anyone dealt with music producer claiming all royalties?

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Illustrative scenario prepared by my practice.
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Hypothetical question

I'm dealing with a situation and need some guidance.

music producer claiming all royalties. I've been dealing with this for about 12 months now and the situation isn't improving.

The contract was signed 24 months ago. I have a copy of the original agreement. The total amount in dispute is approximately $82,000.

Has anyone been through something similar? What worked for you?

Illustrative response

Been there. Here's what I learned.

Don't make the same mistake I did -- is escalating to a supervisor/manager. I'd recommend following the formal complaint procedure instead.