Bad Service CellC - Cancellation not done

I took out a data contract last year 18th June, when it was delivered i discovered I had received two packages one for 10GB day and 10GB night and the other for 500MB, the follow day I called and requested the 500MB contract be cancelled.Going forward I have never made use of the 500MB contract. I didn't check my statement and when I eventually did I called and inquired and found that the contract was never cancelled. I categorically remember cancelled it telephonically. The date of cancellation could be anywhere from the 18th June to the 21st June. There should be a voice recording. Which means that I have been paying R92 per month since last year June for a contract I wast using. I was told on Thursday I would be contacted within 24 to 48 hours and still no contact. I did however cancel the contract YET AGAIN! I expect a refund!!! The number on question ***