It's not unusual to "let the customer win" and take the hit now to have a longer relationship. Don't beat yourself over it. Learn, move and don't let it happen

It's not unusual to "let the customer win" and take the hit now to have a longer relationship. Don't beat yourself over it. Learn, move and don't let it happen easily again (the bad scope). Best wishes. EDIT: Charge something though. Giving the project for free could make them feel bad if they truly believe you delivered something but not all of it.