Secret "service"

I have been a RCS customer for quite some time. I have not used my card for a while, but last Friday when I swiped the RCS card to shop, the transaction was declined.. I went to Game to enquire what was wrong and the call centre operator told me the card was blocked. I was told I need to send a copy of my ID with a sample of my signature on it. I am told on a monthly basis via emails from RCS that I have money available depending on my credit limit, but I was never informed that my card is blocked. I cant understand that I identified myself with a legal ID at a Game counter, answered all the questions like cell phone number, email address etc and must still send an ID with a signature.