Shops have to phone for verification

Goodday. I am very upset. I have a account with rcs for nearly 10 years. Today I bought items from checkers in boksburg. When I gave them my rcs card, they took my card and id book and without explaining tried to phone rcs head office. The lane was closed and all the people behind me was looking at me as if I did something wrong. They tried 3 times to get a answer. And the only answer I got was that rcs needs to confirm if that card belongs to me. I did give them my id. (This is the first time ever that this happened to me) I phoned them when I got to my car with the response that management would phone me back in two hours time,because they are in a meeting at 14hoo on a friday afternoon. No need to say. Nobody phoned me. My question is. Why now suddenly am I,as a customer been treated this way. If there is fraundelence with your cards,why dont you give me a card with a pin number to type in. Is it really worth it to belittle your clients in this manner. My account was up to date. This is demeaning. No notice was given to me that you have changed your policy. By the way,the amount was for R418. Not thousands.