End-Contract cancelation nightmare

I had a Tablet contract with Vodacom that expired the last day of September 2019. I called Vodacom customer accounts way in advance and asking them to cancel my contact and every month thereafter. Everytime they assured me the contract is cancelled with some sort of lame excuse why it was not captured in the first place , and yet again they deduct from my account. This is really unexceptionable. From being the top service provider to being the worst out there. I really regret ever sineing a contract with them and i will do all in my power to prevent others to do so. There is much better network provider out there that doesn't try to ***** your money. They don't even deserve the one star