Vodacom won't stop *****ing my money after contract cancellation

I had/have a data contract with Vodacom that expired more than a year ago. They kept on charging me, but I did not mine until they spiked the price to multiple times my initial contract.

I them visited the Vodacom offices in Loch Logan Mall Bloemfontein. They went through it and said that the price they were charging was the normal price for the deal on which I informed them that I would like to cancel the deal that had already expired more than a year before.

They then provided the number *** through which you have to cancel your contracts as you can not do it through a computer in their store. On a call lasting 14 min and 21 seconds on 05 January 2021 made at 14:42 I got through and was informed that the contract was successfully cancelled.

Now they have already ****** another two months from me with this supposed cancelled contract at three times the price of the initial contract.