Rude customer assistent

I waited in the payment queue for about 30 minutes while the teller served other customers, when my turn came i informed the teller that i wanted to purchase data but did not have the number but rather had my ID number so he could pull it out of the system. He then began to be rude saying that i should go wait in another long queue so that a consultant could assist me, claiming that it would take long for him to do. Having been assisted in the past witch was just the previous week without have to see a consultant I began to tell him my ID number and as i did so he started saying \you don't know your ID number"which was so embarrassing to me because to shop was full of people as he shouted. Not wanting to cause a seen i politely asked him hand me a pen and paper so i could write it down"