Why dont you just ***** my money?

At the beginning of this year I needed extra data so I phoned Cell C's call centre to give me an extra bundle. To do this you have to take out a recurring contract (very convenient for them). So at the end of the month you have to call back and cancel it, which I did. Three months later I see they are still billing me for this bundle. On the 6th July 2015 I phoned to cancel my entire contract and to stop this extra charge as I am not using this extra data. I asked for a reference number for the call and was told it would be resolved and they cannot give me a reference number. In fact when I insisted I was treated with hostility. Like clockwork I see they have deducted that amount again. Instead of spending millions on marketing in trying to get people to move over to Cell C with their new buy out plan maybe you should first try taking better care of your existing clients.