You shouldn't ask for a refund that you don't deserve.
Erin is eating out at an expensive restaurant and is surprised by the menu prices.
Erin wants to save money.
Erin orders inexpensive items and sticks to water for the drink.
Erin complains about the meal and gets it comped.
The service staff is happy to get a tip and the restaurant gains a new customer.
The servers and restaurant lose money on the order.