dudu the waitress that served me at news cafe

I was served by a waitress called dudu at news cafe north riding last night.i wasn't impressed with her attitude she insulted me Because I Wanted My Slip And She EXPECTED Me To Pay Without RECIEVING A Slip From Her. She just said my bill is R235.00 and she got furious and told me she serves better people than me.and we black people think we are better than everyone when its monthend