I told em i would take legal actions if they did not stop using the material they didn't pay for and they reacted immediately. They still refuse to pay because "it's not the results they want" even though they still have 2 revisions and they could fix whatever they don't like. They never gave me feedback on what needed to be changed or was was "bad", they just say it sucks and that i have no talent even after they had originally approved the work because i sent them 1 song fully mixed before i did the rest of it.
Here's another funny thing, they just sent me a message saying "we'll pay you 100$ if you give us only the vocal tracks mixed because we think they sound bad ass" HAH! ...they're funny.