Card blocked, poor service

I made a purchase at a store on the network, was then phoned by somebody claiming to be from RCS to confirm my purchase, They then asked me to give them my ID number over the phone. After which I told them that I am not comfortable giving my ID number over the phone, the person said that it was fine and I will receive a SMS with instructions. When I received the sms, it stated "As we are unable to verify the last purchase made on your GAME SA, we have placed a security block on the card for your protection." apart from the sms giving me the wrong number to call, when I got through to an operator (eventually) they failed me on my security questions, which was answered correctly. Now I have to go through a lot of drama (emailing of my id number with signatures etc.) just to have the card unblocked. Poor service.