Bad service

Went to buy some take aways.Get greeted in disrespectful way by Esther but on slip says Malehlohonolo 17 Trans# 44912 Doc# INO791T ********** 06.She greeted me with "Hey Baba want do you want" not Good day Sir how can I be of assistants.I gave my order and handed cash to her and she threw my change down on counter like I'm a dog.I told her what she did wrong and she laughed out loudly at me.I told her I'm going to put in a complaint and she laughed at me again.She even made a mistake on my order and said she got nerves when I said I'm going to put in a complaint but I only complained after paying.I think they also spit in my food to be spiteful.I put everything in dustbin because it looked like spit in my food. Not happy at all but I'm sure KFC won't respond because they have more than enough customers.