MTN Contract cancelation

I really.....really ****ed off with MTN right now, after being their loyal client for more than 6 years, this is the service I get from them. In November 2020 their consultants where calling me none stop telling me that my contract is coming to an end, I qualify for an upgrade and I told them I don't want to renew my contract because I don't need data anymore, I now have Wi-Fi at home, and they told me what i already know, which is to call the cancellation department to cancel the contract, which every time they call me i will ask them to refer me to the cancelation department, because i thought if maybe when they transfer me, they will take my calls, because i have being calling and calling, holding on for more than an hour on the phone, but no answer, on the 30/11/2020 i decided to go to the centurion branch, the one next to chicken licked to help me with the cancellation, and which they did and got an SMS immediately telling me that my contract is set to be cancelled on the 11/30/2020 an MTN consultant will be in touch to confirm this. But they never did, and on the 17th of Dec 2020 my account was top up with the usual data, and i called the cancellation department, and again waited for 1hr:35 on the phone, no answer, i sent the customer care department an e-mail with Reference Number: *** , to tell them that i have cancelled my contract but i see that they have top up my account with the usual data, so i hope I won't be expected to pay for that. I got reply telling that my query has been escalated to their retentions team for assistance. And again retention team never get back to me, i called and called no answer still. Today my line was cut, apparently i owe MTN R3000 and something, and i must pay that money before they can open my line and cancel it. I had to hold on for 1hr: 58 minutes before the cancellation department can answer my calls. I don't know how many contracts i had with MTN and i have never struggle like this to cancel my contract, I'm really disappointed at their service and God knows, i won't pay that money shame, not after the effort i made to cancel it.