yet another ***** at MTN

someone de*****ed my account again. first time it was someone from working inside MTN. this time I am not sure who it will be. my number is being used by someone and he is abusing it. my bill currently sitting at 4.9 something I was told last night. i requested that the number should deactivated, still nothing. I have tried to do a sim swap, apparently the guy using my number is declining any sim swap. how can someone else my contract number? i honestly don't get it with MTN... i am even tired of being rude on the phone because mtn has given me the biggest headache ever. after the first *****, i was told that my account will be cleared andi was able to do an upgrade, and so i did an upgrade this month. the phone came together with a sim card that i cant use because someone already using my sim card and abusing it... Mtn please help me clear my name, this is too much really...my contract number is ********** 808 that the other person is using. and can tell again it is an inside job for someone to get all my information and use my number ...should you guys want to contact me, use my number i put on hellopeter