WOOLWORTHS CARD REJECTED WITHOUT REASON

I have an account with Woolworths for the past 20 years. My credit limit is R15 000. Since 25 Aug 2020 I am not allowed to buy on my account, although it is paid up. When I want to pay at the Louis Trichardt branch, they have to phone head office apparently to confirm I am who I said I am. Then head office kept them on the line for more than 10 min upon which I decided to pay cash for my purchases. They have phoned head office 3 times now. And still I am not able to use my card. I also tried to order online today, and my card was rejected. Why didn't head office phoned me to confirm my details ?