cancelled contract

I phoned in about 4 month ago to cancel my contract, call centre is ***********, they hung up twice when asking them to cancel my contract, i phoned in again after that and was kept on hold so long and then I send an email to advise I want to cancel my contract. I wanted to cancel at the george branch but was advised I can only cancel contract with head office. Now I recieve an email to advise me I owe R645. I signed a contract almost 5 year ago and i can give a month notice to cancel. This is unacceptable and extremely bad service because I have always paid my montly fee, i've never skipped a payment. Email me for feedback my membership number is ***5.