I'm surprised they allowed that brake (non)job to leave the shop. That is a lawsuit waiting to happen. I would have insisted the customer at least physically write on the invoice that they declined the work.
“No persons are more frequently wrong, than those who will not admit they are wrong.” -- François de La Rochefoucauld
"Those who cannot accept the past are condemned to revise it." -- Geo. Mathias
The German word for contraceptive is “Schwangerschaftsverhütungsmittel”. By the time you finished saying that, it’s too late