VODACOM KEEPS DEDUCTING FUNDS LONG AFTER CONTRACT CANCELLATION

I've always had good service from Vodacom but lately I've been having a big problem with them. I called at the end of May to cancel one of my contracts. They quoted me an amount that I would have to pay to get the contract cancelled, which I paid at the ened of May. It is now December & they are still deducting money from my account every month. It's between R400 & R600 every month. I've stopped the debit order at my bank but they simply put it through again. I've called, visited their stores but still every month they deduct the funds from my bank account. This is **************** & if they don't do something about it very fast, I will be forced to take legal action against them!!!! Where in the world have you heard of a company taking money after the funds have been paid & an agreement has been reached? I never thought Vodacom capable of *****ing from their loyal customers but I guess I thought too much of them.