I also voice that you need to rescind now. How sure are you that you want a diamond resort as there are others resorts out there and while I like kbc, there may be others you will like better as there are things I dont like about kbc as well. I dont own in the hawaii collection and was told the same thing, that I couldnt get in there if I didnt own there. Understand I was staying there with my ownership in the us collection (club membership). I went back to the unit after the sales meeting and found plenty of availability for the times I would travel. Granted these times are not the super high seasons when school is out but far from being abolutely no availability, there was plenty if you did a little planning.
Rescind, spend a few months learning about timeshares before making a purchase if you decide to make a purchase. The money saved buying resale exceed the few loyalty benefits you get when you pay full freight.
Dont buy timeshares for the loyalty benefits or for car, cruise or airline exchanges (there are times of exceptions but they are beyond this discussion). Even the loyalty benefits are more costly through the club than paying cash to the vendor. For example, they will tell that gold membership get 30% more benefit increase over basic membership, what they fail to tell you is that while you pay 16 cents per point in the hawaii collection (14.1 in the us collection) you get back at most from the exchange is 8 or 9 cents (platium gets 10 cents) plus in some cases you also pay a processing charge. The use of your points for anything but rooms is a money loser.
Is your 2500 points in the club (did you buy from diamond or resale), if from diamond, you have a membersip in interval international and while they are off peak periods, you can get some great weekly stays at great rates.