Booking.com Worst booking experience ever encountered

Booked for 4 nights stay at doubletree Hilton through booking.com with email confirmation.turned up at the hotel and they did not receive my booking at all!hotel managed to give me only 2 nights as they were fully booke and I had to call up booking.com to find me another hotel for the remaining 2 nights which was a 3 star hotel.wasnt a good experience for my pregnant wife and myself.steer clear of this website!!