Refusal to cancel contract on numerous requests

My contract expired in November 2015, I was not advised of the cancellation and was automatically moved over to pre-paid billing whic is 3 times more than the contract I signed. Asked for the contract to be cancelled and was advised that the contract was cancelled. Checked in two days later and was advised to go to the Telkom shop. Went to the Glen, filled in a request and was advised that contract will be cancelled. To date the contract has not been cancelled. This is a deal with absa and I am going to take this up with the bank a swell. I work for the bank and will have the conversation internally to review this offering. My Telkom phone number that was requested to be cancelled: ***. Please advise why this has not been cancelled.