Woolies lack of consideration for customer

So I have had a woolies account since my varsity days in 2003. Conducted my account quite well. Today I went to the food store, get groceries and use my card to pay. Turns out that the card is blocked. I get assisted in establishing why my card has been blocked, the staff member calls financial services who tell me that a suspicious purchase was done on my card on a certain day. They blocked my card because of that. How does a card get blocked without me being called to confirm if it is me who made the purchase? This drama has caused me embarrassment and huge inconvenience. The most logical thing I thought of doing was to settle my account and part ways with them. They needed my money back in the days, but it seems that is no longer the case. Such disregard and bad customer service.