Lack of action and feedback from Cell C when Cancelling a Service

On 14 Dec I called in to cancel a contract and was told to pay an amount which I did. On 10 Feb, I called in to find out why my February account still reflected this amount and was told that it's because I never called in 24 hours after making payment to say that the contract was to be cancelled. I was not told to call back. Cell C have had my payment since 14 Dec and have not once contacted me to find out why? I was promised a reference number on the 10th and still have not received it. I have tried calling today and the number 084 143 or 143 does not exist according to my network. The number I wish to cancel is a data line and I have asked that I be contacted on one of the the other numbers on my contract. I emailed on 10 Dec and have a case number but still no feedback. This is shocking. I will no doubt end up being debited again this month for a service I don't want anymore.