Bad service at Crowthorne Woolworths

We have been supporting the Crowthorne Woolworths for the last 8 years and have always received excellent customer service. Today I tried to pay with the same card that I always use. The transaction did not go through. I asked the lady if it declined because it is a savings account and might not have sufficient funds. She stated that if this was the case it would have shown a different message. When I requested her to try and swipe the card she became rude and so aggitated that the card flew out of her hand. My only response was "sjoe" as I could not belief her reaction to my request. After this she calmed down and ask if I could pay at a different till as it might be the pin pad. The transaction still didn't go through and I was happy to pay with an alternative card. This happened at 4 in the afternoon when the store was not busy. I think the name of the person who assisted me was Koketso. I am really disappointed and after my experience today I will no longer support the store.