I understand your great desire to have this issue cleared up before you get there; however, if they can't guarantee the connecting rooms, wouldn't you rather know in advance, and have the opportunity to switch to a resort where this CAN be guaranteed?
Room assignments are a complicated thing. Many people may want, and have great reasons to get connecting rooms. They also want certain floors, certain buildings, certain views, etc.
People are constantly checking in and checking out, so it is not always easy to keep the connecting rooms available for those who request them. And perhaps there are just relatively few connecting rooms at CBR, so they don't want to overpromise. I'd much rather have this situation than have them say "no problem" and find out otherwise when I arrived.
On the other hand, if they have lots of connecting rooms, and it is possible to guarantee them, and you're just getting bad information, there's no excuse for that.