Mtn *****ent port request _no ***** regulations in place

My mother Sim card was ported in june, she ported back and made a complaint in the store that she did not request for her Sim card to be ported. Mtn was able to reverse the port after her request. The same thing happened in July _she did the port reversal. Now in August she gets messages about airtime purchases from her miladys account and Mr price account which you can buy using a Ussd number. She goes to these mentioned store outlets and on the statement it shows that the airtime purchases happened also in june and in July. When we check the dates we realized that the airtime purchases took place the same time when the ********** ports occurred. Now her Sim card was not working yesterday and today; and we just knew that her simcard was ported again. How is it that someone can just port a simcard without my ID? Does Mtn not have any regulations set in place to prevent ********** activities like this? If everymonth there is porting request then a reversal of the same phone number does it not raise red flags to Mtn that there is some kind of ***** taking place. How many times should we reverse the porting