Poor knowledge of Brand match

i was enquiring about brand match today at one of the cashiers today as I found a few items cheaper advertised with another supermarket...when she was unable to assist she called a supervisor to the till.I was approached by a very rude woman.I dont know what her name was because she never even had a name tag on ...she was very rude in the manner she spoke to me an she herself was uneducated about the whole procedure of how brand match works.Eventually it was futile to ask questions and I opted the option of rather taking a booklet to explain it better to me.Please train staff to be more polite to customers especially if they hold senior positions as well as training them sufficiently with new product knowledge.I was terribly upset when i left the store as she spoke to me in this manner in front of other customers.