Lost a loyal customer due to rude cashier

Today I had a meeting and lunch at Fournos and paid by credit card. Getting to the paypoint for my parking ticket, I realised that I didn't have enough cash and went to withdraw money, but then back at the paypoint realised that they do not take R100-bills. I got in the queue at the cashier's desk of Fournos and when it was my turn very politely asked if it would be possible to get two R50's for a R100. The cashier told me that she cannot open the till (which I understand) and since there were no one behind me I waited until the next customer wanted to pay, after which the cashier very rudely told me that she cannot help me. I told her that I just spent 2 hours in the restaurant and didn't think that it was too much to ask to help me out. She was genuinely very rude.<br> Being in business myself, I am very thankful that she doesn't work for me and I think the owner/manager would like to know that a very loyal customer will not be having any more business meetings or lunches at this restaurant. Very disappointed.