On May 31 I booked two nights at the airport Hilton Hotel in Munich through Booking.com for September 3 (the night of our arrival) and September 24 (the night before departure). Both reservations were confirmed by Booking.com. We stayed at the Hilton on the 3rd and I paid on departure with my Visa card....no problem. We returned on the 24th to check in and were told at the desk that our "confirmed" reservation had been cancelled due to a problem with the credit card....the receptionist did not know why, but suggested that perhaps a number had been switched or something (made no sense). We had an early flight the next morning (the 25th) and had no choice but to accept the room they offered at 200 euros more than our "confirmed" reservation (Octoberfest drastically inflated prices). When I returned home I found an email from the Munich Hilton cancelling the reservation due to a credit card problem, but since I do not have access to email while traveling I had not received the message. The email message was sent after our September 3rd stay when I had used my Visa to pay for our room. I contacted Booking.com and they didn't know what happened, but contacted the Hilton. Neither the Hilton or Booking.com will take responsibility for the credit card error, costing us 200 euros.