Refuse to cancel my contract even after over 7 phone calls

Vodacom has to be the worst company I have ever dealt with. I have been trying to cancel my contract since end Oct 2021. I have spoken to over 7 consultants, several of them confirmed that it was canceled but have ****. They have wasted my time and money. The last consultant Ayanda said that she didn't have the correct access to check my info and would call me back with one of her Managers no call. It's so ridiculous. They intentionally don't cancel when you request so they can keep on debiting you. What do I have to do in order to get my contract cancel. I am tired of phoning over and over again. I don't want nothing to do with Vodacom.