Cafe 17

I've been a customer for over a year faithfully. I placed an order and specifically told the lady what I wanted but once I got down there I had something added that I never requested. I tried to explain that I never ordered it but instead of acknowledging the fact that the cashier messed up I was told I am constantly making them lose money and argued with me. I gave the owner the salad back and told him to keep the money and the salad. Very poor customer service and I am hurt by the way I was treated.