Not a good day for shopping

Went shopping at Woolworth's. Wanted to use my card but was told by teller she cant help me. I have to pay first. She was not able to see that my account is in credit. No arrears and and enough credit available . Then l believe a supervisor came to help because she told me she must phone to find why they cant help me. The person on other side just drop the phone when I started to talk. I clearly got the message. They dont want to help me. In over 20 years I am with Woolworth's I never had any problems so I can't understand what went wrong. I can think that training is a problem because the first lady should have been able to see that I didn't have to make a payment. Because I didn't want to make a issue I was also buying a bag because she stuffed the goods in a bag that I knew it was not gona last to the vehicle. Its small things that I see that let me wonder why I want to keep this account.