Mtn contract cancellation or termination

I opened a contract with Mtn 2019 June so the contract was ending 2021 July so the last month of my contract I went Mtn and ask how much am I owing them they told me R200 which I paid and I told them I want to terminate the contract they then told me to go to the main brunch at menlyn or Brooklyn I went to menlyn brunch only to be told that my contract dates have been renewed and the guy from Mtn advise me to call Mtn and ask them to change the dates to the correct dates, so the whole of last year I have been trying to call Mtn but they have never assisted me about it ,it’s either they will put me on hold or drop the call on me or say the a referring me to a specific department but no one will answer the call .

Then I decided to go back to Mtn store again and at the store they told me that my contract has been renewed / upgrade but am asking self how is it the SIM card upgraded because I cancelled it and I payed what is due to them and by that time when I opened my contract with them two weeks after getting the phone my phone was stole and I blocked the phone and cancelled the SIM card and ever since then I have never unblocked them but now am been told that my contract has been upgraded but my sim is not active I don’t have anything that shows that I have upgraded my contract .

And now the is people from Mtn that calls me everyday day and tell me that Mtn will black list me but when I call Mtn the don’t assist me and they are not responding to my emails about the contract issue that I have with them and also about the termination of the contract and When I go to the store they tell me that they can’t help with my problem I have to email retention department and I have been doing that but no answer or respond from them about the contract issue or termination of the contract