contract cancellation.

Have after numerous fone calls to the number given by the cell c shop still been unable to cancel my contract that expired over a year ago.Although they have only just recently suspended my line. They were still charging my fone with the R50.00 airtime after i had to change my bank account, due to my card being ******.I personally went to Pavillion the the main Cell c branch to cancel my contract and pay what was owing and was informed that i would have to go to the bank and deposit the amount and then go back to Pavillion in order to cancel this account. Not only is the Pavillion far from residence but also the inconvenience and then to have your time wasted, to top it off. All i want is for this contract to be cancelled and i will deposit what ever is owing. Is this too much to ask. I thereafter called Cell C and complained about the incident at the pavillion and was informed that a consultant would call me back, i'm still waiting and that was over a month ago. I will never deal with Cell C again and i'm disgusted with their terrible service and attitudes.