attitude from teller

Yesterday I went to Shoprite Sanacardia in Pretoria to buy bread. When I got to the tillpoint my bread did not have a price tag. The lady who was assisting me told me to take a price tag from the till. While I was doing that a lady called Johanna who is a teller responsible for the next till point snapped at me and asked me what the hell was I doing on her till and I must go fetch a price tag at the back where I found the bread. As I walked away to fetch the price tag she continued at me