Music Licensing Question - client reselling my photography

Using a throwaway bc my boss knows my main. Looking for advice on a legal issue. Here's what happened.

client reselling my photography. I've been dealing with this for about 3 months now and the situation isn't improving.

This involves original creative work over the past 35 months. I do have documentation proving my ownership and timeline.

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

Have you tried reaching out to your state's labor board? They sometimes have free resources or mediation services no cap.