sim swap

I've been trying to do a sim swap with mtn since 26 of April up until now they are failing to help me, I have answered the security questions, faxed an affidavit with a copy of my ID, RICA'd the old number for more than 3 times. They are sending to mtn stores if I go there I was told to contact customer service, I do that they tell me to phone rica. Nobody wants to help. I just want my number back and I will leave them in peace.