Unhappy Vodacom Customer

I got an sms this morning to state that "We have received a request for a new or replacement SIM card. If you suspect ***** and have not requested this new SIM card, contact Vodacom Customer Care on 082 135. Your SIM swap will complete within the next 3 hours" I phoned them but you get a menu selection and not an opportunity to speak to a consultant and then they had "Tobi" sms me and there also no option to stop SIM swap, I eventually phoned my local Vodashop but it was too late to stop SIM swap but at least they could block my number, now I have to go and get a new SIM card and it is extremely inconvenient as I also use my phone for work. The one thing that baffles me the most is that when I get a new phone or SIM card, I have to Rica it, so how can someone just do a SIM swap without my credentials?