Cell C worst customer service

So I lost my sim card a few weeks ago and I have been trying to get a sim swap done, but I seem to be getting the information incorrect and the sim card I was using is registered in someone else's name, however I been using the sim card for over 5 years,so when I spoke to a rep at the call centre I was advised to do an affidavit and go to the nearest cell c store, which is what I did however I was turned down, I then spoke to a team leader by the name of Mthokosizi when I called again and he advised me that the branch can definitely help me if I have an affidavit, so again I went to a branch and then spoke to a manager by the name of Magdalene at Gateway and she turned me down, I asked for a way to escalate the matter and she gave me a bogus number for the KZN head offices which just rings and rings, so now I am stuck because I used that number for a number of important things such as business and banking but now I have to go through the admin of changing my number because everyone refuses to help.