disgusting service

i was at mcdonalds ans i was serviced by a lady with a name of Virginia (by the way she doesnt even deserve to be called a lady), she gave me a wrong order and on top of it she over charged me when i approched her about it she doesnt attend to me she tells me how busy she is that she doesnt have time for cause she already gave me service and she wont waste her time on me again i should just find someone who can assist me cause she wont or i should call her supervisor to assist me. I stood there for 40min for my food and change that i didnt even get cause she was a useless waitress. i am honestly not happy about her service im so digusted.