I really suspect now it's OS intentionally do this. They will play the game of chicken, and those who fear being denied boarding will either call them or cancel the ticket. Perhaps in some better cases OS can even claim the EUR280 ish ticket cancellation fee. If that's why OS has chose to stay silent and say nothing, that's really disgusting and irresponsible of them.
Just curious, are there different fare rules out? My cancellation fee says 250€ and not 280€.