Vodacom cancellation

I have been trying to cancel a data contract since September 2020, the contract has expired months ago already and it was on a month to month contract since then, which I was informed could be cancelled at any time. After about 5 calls and confirmation of cancellation by various call centre agents, I am STILL being debited for this contract and the last agent that I spoke to said that her colleagues misinformed me and that the contract will only be cancelled at the end of November. I explained to her that that was not what we agreed on and she simply said that there's nothing she can do, and that I wll only received my refunds after the dispute has been resolved. What dispute??? I cancelled a month to month contract which I am entitled to do and Vodacom failed to cancel it on their side! Why should the clients be paying for Vodacom's "mistakes"? I I told the call centre agent that I have been a Vodacom client for about 15 years and that I am really unhappy with this service, I told her that if this is resolved immediately, I would have to cancel my other Vodacom contract as well. Her answer to this was "sure, if you need help to cancel a second contract, I will help you". What kind of service is this? I am extremely disappointed in Vodacom and would not recommend their services to anyone anymore.