*****ulent transaction

My business account is still sitting on a negative balance of R41k supposedly to be bank charges raised on ***** transactions which I have nothing to do with it ,I was promised that this would be sorted out In 7 days yet its not ,my business is suffering I can't transact people continously depositing payment into the account and I can't access it because it's being taken by these bank charges ,something really needs to happen before I take this thing further