Disgusted & disappointed

I'm very very disappointed and angry. i settled my credit card 3 weeks ago and got a ref number confirming that my acc is closed and settled. Then today my account is being debited. i called in and spoke to a clueless consultant who then called her supervisor, a lady by the name of Pryashni Maharaj who also didnt know what the hell she was talking. so she says African Bank's processes say it's "impossible" for them to refund me if i dont send a statement. So basically i must go out of my way and get a statement bcos they want to prove that its the right account(the same account that they debited without my consent). i need something done about this matter and you must train your "supervisor" correctly on how to speak to customers and explaining things. i will NEVER EVER again open up an account with a company that just takes peoples money while the account has long been closed. PATHETIC service.