Absolutely rude

Yesterday I went to Checkers in Heidelberg Mall to buy my monthly groceries. I had just gotten off work. At the till when paying, I wasn't greeted at all. When I paid the lady rudely told me that I was short. When I asked if she was sure she gave me a horrible look. I had brought in an empty bottle of water and even showed it to tje security guard before going in the store. Another lady at the till picked it up and actually scolded me for bringing it in. I showed the guard, is it not his job to mark it. I understand working on a Sunday isn't ideal. But I work 7 days a week and would never treat a customer the way I was treated. My husband anf I have agreed that will never buy at this Checkers again.