Struggling to cancel MTN contract, poor service

I took out the mtn uncapped home 20mbps flte contract. First I was struggling with getting the sim to be activated(called mtn a few times and getting nowhere) eventually it was activated, then the modem still didn't work been spend 100's of hours with customers service and no luck they just kept dropping the call or putting me through to another department( so I went to google and found out that the lte modem they give me did not have the right APN set up, setup the apn wow it works)Then after a few weeks of usage mtn throttled me like I used up the FUP data cap of the uncapped package(again on the 135 line for hour, days weeks and still getting nowhere.. eventually they figured out my data cap was not setup so it has not reset at the end of each month causing very slow speeds) By now I was fed up with mtn still getting slow speed and no help.

So I have called them multiple times for a cancellation fee and ref, they gave me a ref and the amount I should pay to cancel and also said I have to go to a mtn shop for cancellation.. So I went to mtn shop and the people there said I can't pay it here and that I should call customer service... again calling holding on for hour.. eventually getting a ref and bank account I should number I should pay it in.. no luck the ref is not working and can't pay it.. again calling 135 customer service another ref that is not working, and going to mtn store again back and forth with no luck.

Any help or pointing me in the right direction would be much appreciate thank you

Very Poor Customer service from MTN