I know everyone's had problems at one time or another getting miles properly credited. I've certainly gotten into heated correspondence with more than one program. So the one time that the tables were turned and I was on the receiving end of an unearned bonus - I decided it was only justice being served (well over here we all have convict blood in us anyway)
I was once flying BA 1st class (yes they do sometimes let colonials slip past)from Kuala Lumpur to Adelaide (ADL) and when my statement came through (on a partner airline's FF program the name of which I shall keep secret to protect the guilty) I'd been credited with a flight from KL to Aden (ADE) in the Yemen Republic.

What's the big deal about that - there's only a difference of 400 odd miles between the two flights. Well the real bonus came the next day when I flew from Adelaide to Melbourne -and,yes, I was credited with flying Aden - Melbourne, a distance of 7256 miles compared to the 398 I flew. And the 1st class bonus on top of that!! It was at a time before automatic tracking - you had to send in the ticket and boarding passes. So some geographically illiterate person in the FF service centre probably just took a short cut and thought "Adelaide -ADE" for which I'll be eternally grateful. In those days 12500 points were worth a lot more than today.