We once sold a high quality Burgon and Ball garden fork to someone...
They came back about 13 months later and one of the tines was bent, They insisted on an immediate refund as it was a "shoddy item" and he "knows his rights". I asked how it happened and they started getting really p!ssy, saying "that's irrelevant", and eventually that the gardener was just forking over an ordinary flower bed.
I explained that the only way that this would have happened to a fork was if someone was using it to prise out a deep root or stone (which it's not designed to do, it's not a crowbar!), and they'd repeatedly put all their weight on it. The fact it hadn't broken showed it was a quality item.
They started shouting about going to trading standards and writing to You and Yours - I said I'll investigate, and if it turned out to be a duff fork they could have a replacement or refund and to come back in a week.
So I took it home, put the tine in a vice and bounced on it until it was straight (about 1/2 hour!) - no signs of cracking or obvious fatigue.
They came back in about 3 weeks, still sour-faced and p!ssy. After I'd explained how long it had taken to straighten and how much effort they left without so much as a "sorry for being a miserable git and trying it on!"