Copyright Infringement

You probably need to have your attorney contact the label who's distributing your music, as it's really them with whom you have the primary dispute. You can try emailing itunesmarketing@apple.com or independentlabels@apple.com, if you haven't already, and see if you can get a reply with any useful information. They're not just going to take your word for it, though, so it would probably be best if you have your attorney contact them. Alternatively, your attorney can write a letter to Apple Legal at their corporate address:

1 Infinite Loop
Cupertino, CA 95014

Good luck.

That email is for questions concerning the usage or licensing of Apple copyrighted materials, not for issues with material carried in the iTunes Store. So don't be surprised if they never respond. But it's possible that they'll be able to point you to someone who can help.

Again, good luck.