Pandora,
You know that crewing is no joke - it messes up peoples' lives daily - BUT don't shoot the messenger. The crewing dept gets a list of flights to crew and a list of pilots available (or contactable) and their job is to crew the a/c. They have all sorts of managers on their collective case. In many companies it's a wonder that they do the job so well, given the pittance most are paid.
Never forget, when you have the choice between conspiracy and cockup, always go for cockup - the odds are infinitely better!!