Unauthorized porting of my Vodacom number to MTN.

MTN has ported my existing Vodacom number without my consent or authorization. I received text messages last night of my number being ported, I responded by "pressing 1” opting to cancel. That number port was declined, however they just ported my number again to a different number. Still MTN. This time without an option to cancel.

I woke up this morning with no service. I've called the MTN porting service and apparently they will reverse it in 2 hours.

How is MTN porting numbers without authorization or consent? Apparently a one-time password is sent to confirm porting. This step was overlooked. How is this possible? This is *****. Why is the porting consultant blasé about it as if *****ing one's number, especially linked to ones Banks accounts is a norm?

What is going on MTN?