Welcome, MomLC
Just in case you didn't know, CRO is Central Reservations, and WDTC is the Walt Disney Travel. They are slightly different but each accepts room only reservations. The WDTC phone # is 1-877-939-3731. Make sure you request a "room only" ressie with code BAT. Just say, "Hi, I'd like to see if there is any availability on such and such a date with code BAT." They'll take it from there.
Also, check WDW's website for the Fall discount code (BAS).
Good-luck