VODACOM TERRIBLE SERVICE AGAIN *****ING MONEY

I have phone Vodacom to cancel 2 contract lines for 3 months in a row now. This month I had to pay again for these 2 lines I wanted to cancel. I phoned and they told me they would phone me back the next day. No one phoned me back to cancel anything. Like any working person I got busy and realized today again I paid for the 2 lines. I phoned and explained my situation then the lady offered me to upgrade my line which she claimed was on a flexi 120 line where as in fact my line is on a red vip. I need urgent assistance with this!