I booked a room only for DH and I and when the packages came out I was able to call and change it to a package, BUT they cancelled the room only and then booked the package. Apparently, the room only ressies are in a different "system" than the packages.
They were not able to transfer our deposit...they had to credit our card and then once that hit I called to do the deposit on the package. The refund was really quick, IIRC.