She shouted at me in front of customers for no rzn

I went to Mr Price home at Kerk street Johannesburg to pay for my account and get winter sheets. As I was checking on the sheets Sarah was standing by the door and she asked \what is it that you want?"(In sepedi) and I pointed on the sheet for queen bed and she said\""you only want the price ne?\"" The look on her face and the tone of her voice were not appropriate. I said I want the sheet. She took one of the sheets and told me the price but because I wanted a sheet I took one from the shelf and she screamed at me \""why are you taking that because I already assisted you\"" I told her that I am taking them because I want them. I honestly don't understand why she was under the impression that I am not there to buy and why she shouted at me"