MTN knows nothing about people/client first!

I have had a horrible experience with MTN, I was called 2 years back that I have arreas on my account since I did not close or cancel my contract and was handed over to NUDEBT, of which I understood since I never called to cancel account and paid it off, now the struggle for an entie year for them to check the proof of payments from NUDEBT and close the account, their legal department took more than 3 months to respond on email, advising that I still have an outstanding balance of R411, I then paid again directly at the store only to call and find out that they have not allocated that amount to the account and I might incure other charges again, this is honestly draining, I do not need anything from MTN but just for them to remove the status on my account and close and cancel that contract. whenever I call their call centers, agents are rude and never want to assist and continue referring me at the store.