I called the number and asked them to place me on the Do Not Call and they were happy to do so. It is the Hilton Grand Vacations and they get their caller list from the Hilton family of hotels.
Same thing as some previous reports: They've called our house twice this week, usually between 9:30 and 10:00 AM. They just called again, I answered and they said nothing. "Hilton" pops up on the called ID, and the area code is Orlando, Florida.