Wrong order as usual

I’m quite tired of getting home and finding something missing in my order from kfc. The lady at the drive through told me that they didn’t have enough gravy to give me as I ordered and extra one. Then told me “oh never mind they have one”. I get home, payed for an extra gravy but guess what! No gravy !!!! Now I’m supposed to go all the way back there and tell them they missed something just to hear an “I’m sorry here’s your gravy” and I must leave and be happy.