Bad service and attitude

The service I received at pick n pay trade route mall from a manager named maggie if thats her name coz she didn't even have her name tag on was horrible. I was not feeling well at all as i had surgery a few days ago and went to her to pls ask the xpress tellers to let me pay by them coz im not okay and i was just paying for 6 items. The attitude i got from her was something else she just didn't care about what i was saying. She said she cant give me preferences even after i showed her the condition in im.. She said they are old pple who have diabetes and everything else but are still standing in the line so whats special with me coz if she does that than everybody will be sick. They is nothing she can do. I must ask any of the express tellers to assist me if they will also want to do so. But in essence her service was bad she just did care or is it because im black hence she saw the need to address me the way she felt like..