Telkom nightmare

My contract expired, l have been begging them to terminate, no avail. Today l got a shocking bill of my life, after l have called the call centre numerious times and l was told the 'mighty cancellation' will contact me which has not happened even today from 7 October 2015. I had a nightmare in the beginning of this contract.. same/similar at the end. Can they please put this nightmare to an end?? The team leader in the contact centre does not want to come on the phone and speak to me. SHOCKING SERVICE. Shocking service.....