Honestly, the renter is very slow to communicate.
This does not sound good. Before continue, what resort is this? Wyndham owns a lot of variety of resort, and if it is point resort, the landlord is point owner, it will definitely has confirmation number. But for some old resort(s), the owner could be week owner, and they will not issue and GC. So you should have a contract (actually, you should call the resort to verify the landlord is the owner of the week before you pay if that is the case).
There is one possibity, the owner rent you an exchange, if that is the case, then it will be very unfortuantely event.
I will call landlord first to see what happen and see if there is any issue, than I will call the resort immediatedly to check if the error name is recorded to use the week at this moment. If so, hopefully, you can correct it. I certainly hope you have a contract on hand. If not, I will ask the landlord to be on 3 way in that call.
Jya-Ning