Horrible Service

I have been trying to cancel a contract to absolutely no avail. Vodacom is a horrible bunch of ******* out to ***** your money. There is a contract active on my name since 2017 I have no such Sim or contract, money is being deducted from my account monthly yet I can not get them to cancel the contract. I have made numerous calls, visited stores all to be told u have to call, the call line does not work, what must I do to get this contract cancelled and for Vodacom to stop *****ing my money. I am considering legal action if I am not contacted and this is not removed asap.