Worst customer service witnessed

I just returned from watercrest superspar appalled at the customer service that I witnessed. I chose a till that had an elderly gentleman in front of me, very friendly. He presented his sassa card for payment, but then battled to remember the pin. He apologized saying it could take awhile. I had no issues, it's a public holiday, I'm in no rush. However, the lady behind the till, her name badge said buyi, was getting incredibly impatient with the gentleman, repeatedly ripping the card out and shoving it back in. Eventually this gentleman remembered the pin as in fact he had taken his wife's card in error. Again he apologized, to which I acknowledged and buyi mumbled something incomprehensible. I move along the till, am courteous and gret my server and politely ask for a bag. She scans my groceries, shoves them down the till and then shoves them into a bag, with no care. Crushing my crisps and my baguette that I just purchased. I always go to your store as I love the variety and quality of the products, as well as the always friendly staff, however after that encounter with the staff member I'm quite shocked.