I understand your anger , I have seen people ripping some of my instrumentals of youtube writing songs over them and uploading to itunes. I also had words with distribution company after a copy write claim was made against my youtube channel for my own instrumental. Lucky for me I had data embedded in to the mp 3 , and I have the original session files which the distribution company didn’t. Legal advice is costly I would try to approach them and ask for compensation , if they refuse try a small claims court to help save your hundreds on legal fees