Many moons ago I had a bloke walk in & demand his money back, less a grand, on a car we had sold a year previously to his 'girl', he explained he had been away (we thought he was out of the country) for a while & we had sold her a dud (in fairness it was a TR7 & they were all 'duds'), anyway we laughed at him, all three of us, he then politely informed us that this was our last opportunity to refund him & beyond this point it would cost us 'more'. we laughed again & he just calmly got on the
& asked for " two cars", we laughed some more & waited, funny how a dozen '****' (his words not mine)with shotguns in 2 Rolls Royce's turning up change your mind, funny enough he ended up getting his extra money.
Sometimes it's not worth the grief 😉