no attention given

I ordered a chicken burger andand double quarter pounder and told them to remove the sauce and replace it with big Mac sauce. I paid and took my order via the drive through. When.I got home I noticed the sauce has been rereplaced so clearly they heard me, but the burger was a single quarter pounder yet I paid for the double meal. I live far from lenasia McDonald's so didn't drive back. I seen there were 2 burgers 2 chips and 2 cokes so seen all I ordered was there, the quarter pounder was at the.bottom. But why should I literally open the.box to check my order, that is staff duty not mine. When taking my order they taking another person's payment, when.taking my payment they taking another order so they don't pay full attention to.a.person.