Situation:
Regular customer who spends about $30-40 per week at your deli (a small chain with a few locations) calls with a complaint.
He just made an $80 takeout order and his large side of fries (meant for several people) was forgotten. You are pretty sure he is telling the truth. A look at his bill shows he paid by credit card and was indeed charged for the forgotten fries. He seems irritated that his party has no side order to eat.
The customer has not complained or asked for anything free in the 2 years he's been coming.
What is the right thing to offer?