Telkom service totally unsatisfactory!!!

My internet contract expired and during lockdown I tried to cancel which apparently didn't reach them. We had already got a new service provider but unfortunately my son used some data during Aug & Sept. I spoke to the customer care people on 5th of Nov after they had put through a debit on my bank account for R1198.70 which I reversed at my bank. The lady there said that before I haven't paid that amount, they could not cancel the contract. I phoned the customer care again on 27th of Nov and asked I they (Telkom) could please deduct the amount from my bank as I wanted desperately to get rid of Telkom. He advised me not to pay, as they were going to put through the debit on the 30th of Nov and me paying would result in a duplicate payment. On 30th of Nov I went to our local Telkom shop and asked the lady there that I wanted to pay the amount owing and cancel my account with Telkom. She again advised me not to pay as the Invoice stated that the amount would be debited on 30th of Nov before 12pm. Should the amount not be put through, I could pay it at Checkers or EFT and then cancel the contract. I went to the store on Friday the 4th of December and told the lady that the amount hadn't been debited and I now wished to pay the amount and to cancel the contract. She printed an invoice which had the new month debit already added and she said that this was now the new amount owing!!! We have not been using the internet since 24 September 2020 and yet they keep adding subscription fees. After trying to call customer care and not been able to communicate with them(the line very bad) I paid the amount of R1198.70 on 7th December and went to the store to cancel the contract only to be informed that I would have to go to Brits as their Cancellation on their system doesn't work! I have called the customer care number on 8th December to now try and finally cancel the contract which now according to them is not eligible for cancellation!!! We have upgraded in June 2019????? I have no knowledge of that upgrade and just wish to be rid of Telkom!!! I refuse to pay any more money for something we are not using.