MTN continues to debit your Account after Cancellation

I am so grieved! I've been waiting for my contract to end so that I can be released from the shackles of MTN & their terrible service. I called them to find out how soon before expiry I could cancel. They gave me a date. I canceled on the date and of course they have continued to debit my account for a further 2 months since cancellation. Now I am in the process of fighting with them on call and in store to give me my money back. Absolute *******! In the meantime, I'm convincing as many of my friends to switch to Vodacom, like I did after my contract expired. Decent service and much better costs! I just want MTN to let me go so that I don't have to deal with them again. But they keep taking my money. I'm so annoyed!