McDonald's locations in Gilbert, AZ

I ordered a Fish Fillet MEAL, a SMALL fries, and UPGRADE the drink to a large chocolate shake. As I was pulling forward, I noticed the fries were LARGE on the screen instead of small. I told the guy and he said to pull ahead - - he would correct it at the window. When I got there he said, "That's a fish fillet, large fries, and a small Sprite...." HUH???? We kept going round and round and then he tells me it'll be $12. WHAT???? "It's $4 just for the shake..." What kind of idiot are you???? I should've just canceled the whole thing and left. Will NEVER, EVER go back there again!!! When I got home, they had given me a LARGE fries! A 3 year old could have done better! Where do you get these people from????