Telkom, the ex-girlfriend who refuses to let go!

Telkom refuses to end your contract after the 24 month period. My 2 year Telkom mobile contract expired August 2020. Initially I gave them written notice 2 months and 1 month before my contract expired notifying them that I will not be renewing my contract with them. After 2 months I noticed they still deduct money and when I confronted them they told me that even though my contract expired it is my responsibility to to submit an online cancellation. I did that and another 2 months later they are STILL taking money. Last month I decided that i am going to stop the debit order because i was now convinced that Telkom (like an ex-girlfriend) simply refuses to let you and your money go. A week ago, guess what, I received an invoice stating that my debit order has bounced and that I am now also liable for a penalty fee. They also warned that if I do not settle my account I will be handed over. This is the reward for being a loyal costumer for 12 years. When I seeked help online I was unsurprised to noticed that there is a whole community of people who are in the exact same boat as I am. I have no (zero) hope that I will be relieved from this ongoing trauma but I do hope that other people read this and avoid entering into a lifetime contract of *******.