Contract cancellation made impossible with Vodacom!!!!

Vodacom is making it very difficult if not impossible to cancel contract lines that have reached their full term. I was on a call with their cancellation department after they still billed me 3 months after going to a store in PMB vodacom Alisom communications at Whiiteways in Victoria road. The contracts were cancelled by the store manager Arnold and he confirmed this before I left the store. Months later I am still being billed and when I went back I was told it was a system error. SO WHAT HAPPENS TO MY MONEY???? When I went back i was told that i now can only cancel by calling the cancellations number. My point is I got the contracts from a store why should I be referred to a call centre???? I called the call centre spoke to MASILO for 36 minutes and he could not send a written confimation in the form of an email to confirm cancellation, asked for senior personnel and was left further on hold for almost an hour and then the call was dropped. MASILO was asked at the beginning of the call to call me back if the call is terminated, That NEVER HAPPENED. Vodacom is raping me of my hard earned money and I stand here helplessly!!!