I have an appliance repair business. I charge for labor and parts. I mark up my parts a flat percentage. How do I respond when a customer wants me to breakdown the cost of labor vs parts? Because I know what they are really trying to do is see if they can find the part cheaper on the internet.
I would just quote them a really high price for a job so they’ll go elsewhere. That way you don’t have to refuse their business.
That customer sounds like they’ll be more trouble than it’s worth to deal with them.