Annoyed by my local Carl's Jr. drive-thru giving me a BBQ Chicken Sandwich instead of the Six-Dollar Burger I ordered, I wrote them an email. The response was:

"I assure you that every effort is being made to correct this situation. I have contacted the District Manager regarding your experience."
Okay, that's nice of you...

"I would like to invite you to give us one more chance, on us! I am mailing you some Second Chance coupons good for either a free Famous Star Hamburger or a BBQ Chicken Sandwich. I know there is really nothing that can excuse or make up for the situation you described, but we would love the chance to regain your trust."