Why did you not file around it in the first place?
Mana sounds like you're not even a pilot. I guess some blanket stacker/fax reloader from the office? How many majors around here ask the captain which airway he prefers for his flight? Answer (for you): None.
You're lucky if you get a choice between chicken or beef.
Fox, if the majors flight-planned through "Fett", you'd have to ask the Poindexters in Flight Dispatch why. Or possibly...... the bean-counters! But not the drivers of all people!
As for numpties in the "lesser" carriers blundering through.... we're in the middle east; did you really have to ask that question??