Struggling for 2 years to end Telkom contract and billing

I have been struggling to cancel my Telkom router and data contract since November 2018 (2 years!!). I took out a data contract with Lizwe Ndzwanana but I did not get the coverage he promised me that I would get. I only had 2G coverage thus within the cancelling period of 7 days I've tried to cancel the contract. I contacted Lizwe and he promised it is ok I can cancel my contract but nothing happened and when I phoned him he did not answer and not long after that he's phone number was not working any more. I sent a mail to ***. I explained that I do not get a good Telkom signal and need to return the router and cancel the contract. I gave them all the info on the Waybill and asked that they come and pick up the router with sim card and all documents at my husband's work address. Only weeks after did they eventually come and pick up the router. Then I sent messages about my dilemma on Telkom Messenger on FB. There Maggie helped me and said they have escalated this problem to the cancellations department and that they will contact me. Nobody ever contacted me. The debit orders from Telkom were subtracted from my bank account. I did reverse the debit orders but had to pay each time I did. On FB Messenger I conveyed my dismay of empty promises of feedback and debit orders going through on my bank account. Then I was advised to do the cancellation online through the cancellation process. I could not do this as I did not even know what the sim cell number was as everything was returned via the courier. Maggie said that a request was sent to Telkom's mobile retention team to assist with the cancellation of service. It was already May 2019. I was again advised to cancel online and again explained I can't because I don't have any information about the contract or sim phone number or router. Maggie then said they forwarded an urgent follow up to the sales and cancellation teams. I thought the matter resolved as no debit orders came through since May 2019 but then Sep 2019 they sent through a debit order amount of R933.19. I messaged Maggie and she said that it now has been escalated to the billing team. Maggie came back with feedback that my service has been cancelled but my outstanding bill has been handed over to the collection agency and they debit my account. I asked her how do they expect me to pay for something I never used?? She then said a dispute for refund *** has been logged. The debit orders then came through again for the amount of R933.19 on 7 Jan and 14 Feb. I reversed both at a cost to me. Maggie then said that a case has been logged with the billing team no:***3 and they will be in contact with me. No feedback ever received. The debit orders continued to come through on my bank account and I kept reversing them. My last message on FB messenger was on 8 Aug 2019 telling them that I'm receiving messages from Telkom to pay my outstanding account R933.19. No one rep**** till this day and I have just kept reversing the debit orders when they come through. So I refuse to pay R933.19 for service I never had!