Woolworths Card BLOCKED without explanation.

After selecting items that I wanted to buy on 18 December 2024, I stood waiting in the rather long queue. When it was my turn, the cashier rung up my items. I chose to pay, using my Woolworths card. However, the machine would not accept my card. An official was called. She came and voided my purchase, and the cashier put my items aside. I was escorted to the office, where another person to attend to my problem. He phoned Headiffice/Financial services? The lady on the other end of the line informed him that my card was blocked. She could not give a reason as to WHY my card was blocked. My payments were up to date. After reviewing my profile (I think) She said that she'll unblock my card immediately. I was very unhappy, and let her know it. I'm still annoyed. I've been a customer of Woolworths since before they implemented their card system. I have never missed a payment. Can SOMEONE please explain why my card was blocked.