Poor Service

I went into the store to purchase a couple of items, when it was my turn to pay the cashier told me that there was a problem with my card. When the supervisor was called she also tried to process the payment but she had no knowledge about the temporary woolworths card and she was of no help to me. The customers were laughing at me because the cashier thought that I did not have any credit on my account. This was so embarrassing for me until they found out that you can not purchase with a temporary woolworths card after a certain time. I had to put back items which I needed. Being a staff at the airport I am a frequent customer at woolworths. Being a customer service agent I know first hand that this was very poor customer service. I would like to know what would be done to compensate me and prevent this from happening to other customers.