over charging and not cancelling

What do I need to do to stop my contract with you? Beginning of nov I go in, get told to take the form and fill it in and send in in from home.... hello the form needs to be processed at the branch!!!! End on nov gou back in as I have not heard anything and to just be sure it cancelled..... guess what... nothing recieved. Now for two months I have been invoiced for over R600 for a R299 contract with no reply as to what the hell is going on. This is pathetic. Numerous calls, emails and watsting time in the store and still no answer, but no problem in taking money, more than the contract by the way!!!! <br> Wish the service I recieved was as fast as you taking money out of my account!!!!