Porting process

I have reason to believe that my mobile number was hacked and used for on-line banking *****. From what I have been able to piece together, my Cell C number was ported to MTN. I've contacted both networks. Cell C said the porting happens through MTN, and they have no knowledge of it. I haven't yet had an answer from MTN, but what I want to know is, what is the process to port a number? What checks are done to ensure that the request is legitimate, and being made by the rightful owner? What part does RICA play? The SIM card was RICA'd under my name - how then is it possible for someone to take my number and call it their own?

These are general questions, to which I seek answers. I have also asked MTN for specific information in this regard, but I haven't yet received anything.

Right now, this number is being used to call my contacts, presumably for continued ********** purposes.

PLEASE CONFIRM THAT IT HAS BEEN PERMANENTLY DE-ACTIVATED.

I await your urgent response. Thank you.