dissappointed by chashiers and supervisor

on the Thursday 26th of November 2015, my friend and I decided to get something to eat. It happened that we were somewhere on Victoria street and noticed a Pick n Pay we immediately decided to go in. I then decided it would be convenient for me that I should also get the cash that I would need later in the day. After getting something to eat, approaching the till I then notified the cashier that I would need to a cashback of a certain amount , I was doing this full knowing that sometimes the till might not have the amount of cash I required so the cashier in question rep**** that she didn't have enough cash. But I started feeling a bit off when the 4th cashier offered a similar response