ported my number without my permission

I would please like to know how my number was ported out from vodacom network without my permission? A couple of months back there was a request saying my number would be ported out and I must confirm. I immediately phoned and found out what was going on and the gentleman said I mustn't worry about it. A couple of weeks later I got the same sms and ignored it. Again another couple of weeks I got the sms again and ignored it again.

Now with no sms, confirmation or my permission I find out my number had been ported out. I only found this out after going to a vodacare centre. I tried phoning 111 and noone could help me because my number wasn't on the system even though I had been using it daily up until the day I lost my number.

Everytime I ask anyone, they say they don't know how my number wasn't ported without my permission. I would like to ask someone how this could possibly happen?

I would also like to ask how am i supposed to trust vodacom again after this? You can lose your number for no reason and no one offers any explanation. It took me a week to get my number back finally. I would like to know how this happened with no authorization from myself, the account owner...