Vodacom avoiding contract cancellation

I have been trying to cancel my vodacom contract for over a month now and keep getting the run around. The first time I was told that my contract is not due for cancelation and I can only call on the first of April to request the cancelation for end April. I called back on 1st April and the call center agent confirmed that my contract was canceled but I never received confirmation via sms and email. I got a call from a retention consultant on 6th April and I told them the contract has already been canceled and I need them to confirm. I was told that she will follow up to confirmation. I never hear back. When I queried again on 8th April, I was told there is no record of a cancelation request. This seems like a tactic to avoid cancelation and is very poor business practice. I need this contract canceled as I requested as I will not be paying for another month unnecessarily due to errors on Vodacom's side.