Original Message:
Re: backing out if confirmation has different date than on posting (by John F.):
You have a bigger problem. It is against RCI rules to rent an exchange. If discovered, RCI will cancel the week and the person's account who did the rental. Doesn't matter if you are on line to check in, you will be homeless that week.
Demand an immediate refund while you can. Threaten to go to RCI if necessary. Tell the person who rented it to read their RCI agreement.