TRS Recovery Services, Inc TeleCheck I stopped pymt on a check(I have the check in my Possession) They have it as insufficient funds Houston, Texas

I stopped pymt on a check where i returned merchandise (was told by clerk I could do this) and he gave check  back to me. I guess he called TeleCheck and gave them this check # and amount because he got no percentage. The main office(Tmobile) has been contacted and they state they have never sent a negative report to TeleCheck, that if the check had been cashed, the bank would have been the one stating that it was insufficient funds. The bank has faxed copies to TeleCheck showing that this was a stop-pymt, and asked them to send a copy of the report they rec'd (from whomever) which they have not.

I rec'd a letter today from TRS Recovery Services wanting me to pay $50 to them for a bad check. My bank has called TeleCheck stating that my account has always been in good standing, AND there has never ever been anything returned to them on this account.