SIM CARD CLONED

Yesterday morning (23/08/2018) , I saw my Nokia phone written insert sim, when I opened it the sim card was there inserted correctly. I then assemble the phone and put it on. The same error message was showing again, I immediately thought the sim is damage. I bought a new sim card from Ackermens (Brookeside Mall - Pietermaritzburg ) to do sim swap. The sim swap was not successful because it was said there was wrong information provided in some of the questions that I was asked. It was said that I must try again later, when I tried to do sim swap again the person assistant me look like he was in a hurry because I received no help from him beside that he said my number ( ********** 746) was no longer accessible and it look like it was cloned by someone and he cannot help me. This was my sim card since 1999 and it a pitty that I just lost this number like this. My policies, my bank, my relatives, I can mention a lot but according to the person assistant from MTN I wont be helped