sim swap nightmare

i lost my my mtn sim card. i tried to call mtn customer care for assistance the first lady who helped me asked me questions and told me she cannot perform the sim swap due to the fact that i failed to tell one i commonly used , i was annoyed because i told her that the numbers i remember which i frequently call are two and cant remember the third. i tried again the next attempt , the second lady so rude asked me same questions and some other questions then she told me i failed again she cant do the sim swap, i asked her where did i go wrong as thats the information i could remember, then i tried third attempt and another lady said the numbers i told her are not reflecting on the system my jaw dropped on the floor because the numbers are called everyday she said they did not reflect on the system and i have failed once again, so now i am left with an egg in my face because i have no solution and i do not know what mtn wants, do i reallly have to go through so much to just get a sim swap for a number i have been using for 8 years and i cant be assisted and the rudeness of the consultants like their robots and not providing a solution. i am now thinking of changing to Vodacom