Originally Posted by serpens

Since the C+P booking is really a points booking where you purchase some of the points at the time of booking, you should get the rebate on the 20K. After all, if you make the reservation and then cancel it, you get 20K points back, not your original points plus your cash portion. Put another way, you are paying 20K points for the room, after buying some of the points at reservation time. However, I have not read the T&C to confirm my opinion.