Originally Posted by
corporate-wage-slave
I guess you don't have a base in Europe. If so then your two lines of complaint would be to LOT, as the Flight Operator, under EC261 - I'd be surprised if they are helpful, but it's the IDB side you need to focus on. But DOT in the USA may well be more forthcoming, though obviously they are not going to implement EC261 for you. They do have their own guidelines for IDB and LOT doesn't have a lot of choice if DOT takes the matter up with the airline.
From a formal point of view if the ticket was marked as fraud, the case was not a IDB. It is highly doubtful that LOT marked the ticket as a fraud, it is almost certain that Aeroplan did it.