Unauthorised Stop Orders Resque 247

I have had my account debited by the above company and 3 others without my authority. I have no idea who these companies are and I want the money refunded back to me. These debit orders are processed on different dates so it cannot even be stopped at the bank and I would also have to pay the bank charges for returning stop orders...which affects my credit rating at the bank as well as the fact that these stop orders are sent to the bank before I get paid which means my account is in the red. i need this resolved urgently.