Vodacom refuses to cancel my contract

I have been trying to cancel my contract with Vodacom since 20 August. I phoned in a month before, I was told I can only cancel on the last day of my contract (20 Aug). Called again on 20 August, I was assured it would be cancelled. Two months later, the contract is still not cancelled and my account is still being debited. Countless calls to *** with promises of escalations and a call back from a team leader - obviously never any contact. No response on emails either. Not sure what more to do?? One consultant this morning put me on mute after telling him that I refused to hang up the phone until my contract was cancelled. The next one asked me to hold on until I received an email - she then cut the call and I still have not received the email. I asked a consultant at a Vodacom branch to assist me, not even she could get the CANCELLATIONS department to cancel the contract!!! Sent a message on twitter and sent out a Tweet about 30 mins ago - Vodacom doesn't seem to care.