Contract Cancellation nightmare

I cancelled a contract 3 days after signing up. The agent confirmed that the contract was cancelled, however, no confirmation was received. Then I called to follow up on the cancellation and I was promised that the cancellation will be confirmed and I would be credited for any amounts billed. To this day (which is 3 months later) the contract has not been cancelled and the number is still active.

I have not used the sim card.

I want this contract cancelled immediately or else I am reporting Vodacom to the Ombud.