Vodacom are useless *******

I literally cannot cancel mu contract. My contract expired in January, after which i phoned through and cancelled the contract, which seemed to have been actioned by the consultant on the phone. A week ago i checked and it appeared i have been paying for a contract that i thought had been cancelled since January. I have since phoned through twice, both times, this number has not been cancelled, contrary to the consultants telling me otherwise. Vodacom is beyond useless and are actual *******. There is literally nothing i can do.