Canceling my vodacom contract

I have had my contract canceled with vodacom for two months now. And I'm still being debited every month. Once I do a reversal. The next month I get debited more. I've contacted the store of which I got the contract with. He gave me a number to contact. That department gave me another number. And that department gave me another number. This is pathetic service from vodacom Up till now I'm still trying to get it canceled