Complaint about MTN please assist

I had to go to through the spiritual celling process for 6 months, and I fell into arrears, I was handed over to the VVM company(debt collectors) VVM called me and made an arrangement for 2 months to Cover the arrears, which ended in March 2020, nothing was sent to me, I called VVM in April 2020 to check the status on my number, they advised that they had sent MTN the settlement letter, and forwarded to me as well, I then also forwarded the letter to MTN (***). On the 13 of May 2020, I called MTN to follow up again, since I didn’t receive any feedback I spoke to Sbongile Chiya who informed me that I still had an outstanding amount of R112.25, I made the payment on the 13 of May at 14:49 of R120.00, I then called MTN spoke to Nonkululeko Hadebe, who informed to send her the proof of payment to ***, she advised to call after 7 working days for feedback. In June I called again to find feedback, I spoke to Nhlanhla, who informed that there was still an outstanding amount of R1125.25, I requested to speak to the Team leader, (Peston Webstor advised that he would log a call providing with a reference - ***) and should after 72 hours, I called on the 16-07-2020, spoke to a consultant who advised that a superior would call me back, Every time I call I am informed that they will escalate to the legal department, but nothing happens and they are refusing to provide me with the contact number, today I called again MTN was informed of the outstanding amount of R1125.25, and that nothing has been escalated since, I am deeply saddened and disappointed in how MTN could treat after being with them for so long, all I am requesting for is my old number back ( ***),