Let's face, an "unreasonable" customer will never be satisfied no matter what you do and will return to make your business life miserable. Cut them lose and do yourself and your staff a favor by telling them that although you appreciate their business, it's apparent you can't make them happy and you are ceasing the business relationship with them.
Great advice.....I need to add something like this to our Kitchen Rules we post .. I am sure you can adapt them to apply to Pizza
KITCHEN RULES
Coffee sales don’t pay the mortgage here – remember business is still all about making money.
Consistency and efficiency will make or break this place.
Serve only fresh products that taste delicious.
Remember each customer expects a cup/plate of magic served to them with a smile.
Be courteous to all customers; including the one with a personality disorder.
Ambiance is important. Make the customer feel welcome and appreciated.
Specialty coffee not on the menu - be flexible and provide the customer exactly what they request.
Annoying, demanding, irritating, pushy customers are still customers.
Leave your attitudes at home, we get enough customers coming in with their own attitudes.
If you don’t have a sense of humor, pretend you have one.
If you can make customers laugh you can make them buy.
Great customer service is not optional – it’s your duty.
No customers = No job.
