Do I need a lawyer that specializes in entertainment issues or specifically issues between authors and publishing companies?

I am a self published author who retired a title online with an amazon.com company. I signed a contract with a new publishing house for the same book (not self published) to reformat and re-release this book. I have not seen a penny of profit from the amazon company regarding sale of said book which their records state is a grand total of 2. I have however talked to indiviudals who have purchased this book on line and so, pride aside, I do not believe their totals are accurate. Also, after I retired this book from their services, I have sontinued to see it offered for sale. I wrote the company regarding this and asked that they contact me. I got several e-mails stating it was theit policy to continue to let third party sellers offer an out of print title for sale on line. I never saw any profits from a third party buyer and count at least 10 copies offered. Still they refuse to remove it from their site, despite my insisting they do so.