I don't know what goes on in the minds of tellers

I don't know what goes on in the minds of tellers. What's worse is that she is very young. No name tag,arrogant,doesn't know prices and even if you tell her,she was still adamant that it's not her fault. I even went and fetch the price at the shelve. She must be retrained. Or leave the retail shops ,it seems as if she is wrongly placed.