Telkom Forced ******* debit order's

I am very unhappy with Telkom. I asked about a data deal a few months ago from Mondo Telkom. I was told that the sim would work on my cellphone or router. When I received the sim card it did not work on my phone. Then I called and told them that I was not happy because I was miss led and I would like to return the sim and cancel the agreement. This was the following day after I received the sim card. I was then told a courier would be sent to collect the sim card then the agreement would be cancelled. I also called Telkom and sent emails about my cancellation on their website. They responded and said my query would be resolved. Then I was told it has been resolved, but no one fetched the sim card. At the end of the month they tried to debit my account and I was forced to reverse it and continued to do so until Mondo stopped debiting my account. All while I was constantly telling them that I cancelled the data agreement a long time ago. They then stopped debiting me for a couple of months then telkom started debiting my account for R 637, which makes no sense because the initial agreement was for R80 a month. I dont know why Telkom is constantly trying to debit my account. They dont tell me what its for, they dont call to ask me why I keep reversing it. I receive no help from the call center agents, they always say they will look into the matter but nothing changes. They dont really respond to my emails when I send them. instead I just get an automatically generated response. I have no one I can address this matter directly with. At this point I am being forced to take legal action because no one at Telkom is helping me fix this problem. Its ******* to debit someones account without their consent or a reason for debiting my account. They even change the reference number so they can keep debiting my account like ********. Yet they never communicate why they are trying to take my money, because the agreement I had with them was cancelled in a day. long before the cooling off period ended, but they just didnt do their jobs now Im in this situation. Im very unhappy with Telkom.