unhappy customer

I went to spur Baywest mall to buy a meal with card voucher, I was served by a coloured lady I wrote her name on the complaint book theRe at their shop. I didn't know that I can't buy less than the amount I had on the card so I told her to cancel the oder I will come back later when I have time to choose something else. When I came back lunch time she had an attitude and asked Luyanda the guy who was serving me what I was buying and mumbled a lot of things I couldn't hear and when I asked her what she was saying she gave me a very bad attitude and told me that she was not speaking to me. That is very rude she can't be speeking about me and asking about my order and when I'm asking her what is the problem she gives me bad attitude and a very rude and scary look.