Disrespectful staff

Groenkloof Engen is on my route to most of my Johannesburg meetings and I stop there at least twice a week. I love the fact that there is a Woolies section. But today's incident changed my mind! I went into the shop to get some snacks and water while they were filling up my car. Since I was using a card I wanted to pay for both at the same time. All the staff behind the counter treated me with such disrespect, making me wait till way after the attendant finished filling up, to pay. I requeste a packet for the snacks before I paid and after the transaction requested if the lady could please pack them. She responded by shouting at me infront of the whole store that I'm wrong!!! As a paying customer I have never been treated with such disrespect. I'm so disappointed and have no interest in stopping there again. Sorry Engen Groenkloof, you lost my support. It really doesn't cost anything to be polite.