mtn poor service for a sim swap

My mtn sim stop working from the 6th of April 18. from then till date i have been doing a sim swap which is of no joy ... EVERY TIME I CALL IS WAS TOLD TO RICA A NEW SIM AND THEN TRY AGAIN I, I HAVE BEEN THROUGH 4 RICA SIMS ALREADY!!!! I have been to the MTN store and the Phoenix Plaza in Phoenix, Durban on the 14/04/18, which the store manager Rica a new sim and did the sim swop around 3.15pm and up till now there is progress. I EVEN HANDED A AFFIDAVIT AND A CERTIFIED COPY OF MY I.D!!!

Every time i call mtn customer care they say system is off line call back in 2 hours , when i call back say the same thing . I even sent a Facebook message to MTN for assistance still no response yet the messages are been seen !!! what more must i do?

THIS IS SO FRUSTRATING AS THIS No. IS LINKED TO MY WORK AND INTERNET BANKING .