Demand of payment for non service by BULLY Telkom

I app**** for the 'DSL Unlimited Home Lite' service with Telkom last year sometime between May & June 2021, between that time and December, the service was disrupted many times some times up a month, In October, I was told that the services would no longer be available because of cable theft, In December on the 13 2021, I went to their store at Musgrave Centre to have the contract cancelled. After queuing for an hour I was assisted by a lady, that also took about 45- 50 minutes at the end of it she said it was fine she would log the cancellation, two weeks later when I did not get any notification from Telkom for cancellation, I decided to go back to the store only to find that the cancellation was not logged! This time I was assisted by the store Manager who promised that it would be cancelled and that I would get a refund from Telkom starting from October. To my surprise, on the 14th of January 2022 I got an invoice saying 'Final invoice' for the amount of 1172.00 of which they debit my bank account on the 5th of February 2022! My question to them is- I am I supposed to pay for their inability to offer the service and incompetence? Or are they simply a bully? I spent a lot of money paying for alternative measures to get internet, when does this end?