Never, ever, ever "assume" that the matter is settled, when it comes to money. Always follow up and ensure that all bills are paid or at least any misunderstan

Never, ever, ever "assume" that the matter is settled, when it comes to money. Always follow up and ensure that all bills are paid or at least any misunderstandings are cleared up. It's clear that there was a mix-up between this guy and Microsoft, and it's very, very likely that the initial error was on Microsoft's side. But he compounded that error by repeatedly not following up, not investigating the invoice (I'm sure that he would have been able to find a reader for the invoice, had he really tried), and finally by actually paying the amount. The last, though, is the least of the problems. Settling for $150 is probably way, way easier than actually pursuing and correcting the matter years too late.