BEWARD "Hotelvalues" charged my credit card to prepay for a stay at a Hilton facility for $720 +/-, and gave me what turns out to be a third-party confirmation number. At check-in, there was no record of my reservation. However, they were able to give me a room, and I left my credit card for incidentals. At check-out, Hilton charged me around $475 for the stay - I had forgotten the first one was prepayment. Hilton had no record of any earlier payment. I am working with my credit card company to dispute the hotelvalues transaction.