Theft Protective Service / took money from my account without my permission and overdrew my accont

I was online trying to get a loan and these people got my bank information and cashed a check thru my bank without approval from me now my account is negative. I did NOT authorize this payment cause I don't need theft coverage on anything.. I called and wanted the money put back into my account but they said I had to go here to get a refund...They did cancel the service that I never wanted and never got... All I want is my money put back into my checking account asap