Sim swap

My phone got ****** in May and MTN was on strike at the time, I only got the insurance replacement phone in end of June and I got that because I drove to the head office. They told me for a sim swap I should do it at any MTN branch on which I did that at Cavendish Glen Kempton Park but for some reason it couldn't happen, they even gave the 2nd sim card to try it again but didn't work. Then Karshin from Cavendish Glen Kempton Park sent an email to the head office regarding that but never received any respond, I called and emailed the head office they said i should go to the branch. basically I was pushed from the branch to the head office and till today I still don't have my number. I don't know what is happening to my air time and data from May to now. I know stopped paying two months back hoping they'll call me but they didn't and that is going to effect my financial record. Please help me I don't know what to do now.