Telkom billing me for a cancelled contract.

On the 22nd of July I cancelled my top up sim. I am still getting billed for the sim. Telkom billing and accounts say that I didnt cancel the month to month, but the voice prompt on 081 180 says that the sim has been suspended. I cannot get through to a manager or anything to assist. I cannot get through to cancellations either. My ref number is ***1, I think as this was smsed to me.