Cancellation nightmare with Vodacom

I called in way prior my cancellation period and I was told to call a month before. I called again on the 15 June 2021 to cancel my contract only to find out that the cancellation agent decided to upgrade my contract. All I wanted was a cancel contract and a new data plan. When I reviewed my statement I saw I was over billed, call the customer care number and advised the agent who then said they will escalate the matter to their supervisor to have the contract fixed. It’s a week now and still nothing is been done. The cancellation agent had said I would now be paying R320 for a data plan and that’s what I had agreed to. Now all of a sudden my bill is R1800 and that’s just for that data. Please cancel my contract fully. Everytime I have to cancel my contract with Vodacom there’s always an issue, the last time I was listed on ITC because of Vodacom and I’m not going down that route again. Please cancel all my subscriptions and contract ***