Not sure what possessed me to answer an unfamiliar number, but my reward was a cheery lady informing me that since I'd stayed at a couple of their resorts in the past (I haven't), I'd earned enough points for a free stay. "Isn't that great news?" she asks. "No" says I, and hung up on her happy [***].
I've received a rash of no-message-left calls lately from the 488 exchange (local), so it seems likely that the numbers are spoofed.