Unfair Billing and additional costs

I app**** for Telkom Mobile Data contract in Mid 2016 for 24 months. Costs was very high while service declined over the years. However I supported Local and kept paying Telkom even though the service was getting worse. From June 2019 service stopped in totality due to Telkom technical failures yet billing continued and I kept paying. I tried many times over 3 months to cancel online but failed. In October 2019, I spoke to Telkom agent who promised to cancel my Data Sim and stated that I am running month to month with no contract so no need for notice. He informed me that I should still pay for November 2019 even though I was not getting service from October as the payments run a month in advance. This was very confusing since I had no contract but was forced to pay for November and there would be nothing in December. There was no communication on sms or email to me even though I requested this correspondence. In November I visited Telkom Mobile shop in Sandton and requested them to check that my Modem Data has in fact been cancelled and they confirmed zero data usage and cancellation in order. I did inform the lady at the counter that if I am billed for December then I will ask bank to reverse which she stated was fair and which I did. I received another SMS on 30 December stating showing a R108.97 stop order deduction and I was very unhappy with this. Tried the call centre and nobody seems to answer after long waiting. Today I visit Telkom shop at my cost of transport and time that’s over R200 then wait in queue to be told that my account is cancelled and there is a reverse charge of R200 because my bank reversed the payment. I am also charged for November and December subscriptions even though there was no data service from October 2019.How can I as a Loyal Citizen keep supporting Telkom if they are robbing me and service getting worse every day. I am very disappointed of the ******* and constant charges that Telkom refuses to stop even up to now. When I tell my bank to reverse the charges then Telkom charges me a reversal fee of R200.Really how ******* can the system get. Telkom you are ****ing good paying customers and de*****ing them in broad daylight. I have incurred over R600 costs trying to cancel a contract that has expired more than 12 months ago. I want my money refunded for all months of non-service and refunds for all additonal charges to date. Unhappy SA Citizen Telkom Shareholder.