Vodacom refuses to cancel EXPIRED contract.

I have logged numerous requests to cancel my contract. My previous Hello Peter request was logged and the Vodacom guy promised my contract will be 100% cancelled. I seen on my latest invoice that they are still charging me. The contract is over 2 years. This amount must not come off my account and needs to be reversed ASAP. It is totally unacceptable. The number in question is 082 734 220. WHy am I still being charged when I spoke to the Vodacom guy 2 months ago. Please refund me if you debit my account.