Many years ago I had a company in to erect a fence, having also bought the panels and posts from them, cost about £400.
They started on a day I was at home but finished on a day I was at uni. Anyway, standing there admiring our new fence, I counted the panels, there were 3 less than I'd paid for and there were no cut panels left around.
Long story short, I called him back, gave him the option of giving me my 3 panels, providing me with the offcuts, reimbursing the over payment or reporting the theft to the police.
He refunded £50.