Filebot only pulls data from the dbases and allows you to massage it; if the dbase format is 'unusual' then FB won't have much chance of working around it.
By 'unusual', I include these 'half-shows', which are typically entered as 2 episodes on the same day - Monsters vs Aliens is one that plagued me while I was first using FB...
Since some people record them individually, and some record them as a half-hour, you as the downloader need to decide what works best for you & your collection habits - and collect one or the other (if a choice exists).
As DX suggested, removing the episode numbers will work - without a number, FB should find the name.
If you wanted to get really fancy, you could create your own complex format that would take each DATE of broadcasting 2 episodes, and re-number them as an A & B - but believe me, while it could be done, I doubt it would be worth the work (and, they wouldn't match the dbase numbers for future reference)!
You might look at a file-rename program to do the episode number removal - I like
http://www.bulkrenameutility.co.uk/Screenshots.php - it's free, and although it looks complex, can do it well.
But, if you're doing just a couple of episodes at a time, even if for a couple of shows... it's probably easier just to manually strip the episode #s before running FB.
