UNKNOWN ERROR WHEN DOING A SIM SWAP

My sim card *** started not to work swapped the sim to a different phone to see if the problem is with the sim or a phone found out that the problem is with the sim as it was saying sim card rejected,went to buy a new starter pack as it was no longer a contract but a pay as u go sim card called in to the call center several time all the consultant said the system shows an ''UNKNOWN ERROR'' I was refereed to a branch near me and that was Maponya Mall went same thing system shows an error that they also cannot explain THE INCOMPETENCE of those people working at maponya mall telkom is APPAULING was promised to be called but not a single person who have assisted me at Maponya have even attempted, a call was logged on the 30th of September 2015 was promised that I will be contacted by a technician till today no one has contacted me and that no is my Business number that my client can contact me on primary no ,alternative number that I can be contacted on is *** I NEED THIS SORTED OUT ASAP PLS