MTN - Read emails but no response - Respond, Just do it!

I was handed over to VVM attorneys for a MTN contract which I took for someone else and I was made aware in March 2020. I paid the attorneys the full amount of R5920.00, including all fees. I was sent a settlement letter from VVM attorneys in March 2020. I noticed a few weeks ago on clear score that I have a balance owing for MTN. I went to the MTN customer care in Menlyn Mall on 6th March 2022 and spoke to a consultant Thabo Mosinki and he said he would escalate the problem. A few days later, I received an email from Thabo which stated that there was an outstanding amount of R4,686.42 that has to be paid for the account to be closed. The message below was on the email as well. Please be advised client's contract expires 2022-05-12 and after arrears was paid with VVM, contract continued but it was never paid that is why client is owing. I called VVM Attorneys and was told that according to them, the account was fully paid. To date, today being 29th March, I have been sending numerous emails to the MTN customer care, Thabo Mosinki, the legal department of MTN to which I was referred and to mtn@vvm attorneys to no avail. The emails have the settlement letter and all the proof of payments. I want an explanation as to why I owe that amount and why the contract still continued 2 years later when the account was settled. I am not getting any responses from any party. I tried to call Thabo a few times and the calls go to voice mail. I am getting the read receipt email from the MTN customer care and the legal department *** but nobody is responding to shed some light on the matter.