Contract fail to be cancelled

On the 15th of December I called to cancel a contract that started on September which was a router, Because I didn't get any joy with regards to the contract I had to cancel. I spoke to Khensani Hlongwane and Sifiso Mbatha, one of them said that for me to cancel the contract I should pay R995. Which I did the same day and he also gave me an email to send proof of payment which I also did. The next day on the 16th I called to make a follow up on the receival of my payment and the person I spoke to advised that the money was received and I assumed that it will be be processed

On the 1st of Jan I received the benefits on the same contract that I cancelled and when I called cell c I was advised by Tshepo, one of the managers that he escalated the matter to cancelation as they aren't open on holiday and that they will call me back. I called cell c can cation dept. on the 4th and spoke to two agents Lerato and Patience with no joy and whom failed to put me through to their manager telling me that the manager is busy with another client. And when I ask them to reverse the benefits they say they can't and that my contract was not cancelled and that they will still deduct the money again next month

I need an urgent assistance with this matter