We booked a 4 night stay in Majorca on 23 April 2015 with Booking, com> We use them regularly! When we arrived the Hotel manager informed us that the reservation had been cancelled and the hotel was full. There were rooms available across the road in another hotel but we had to pay an additional 224 Euros. Have just come off the phone with Customer services who informed me that just after the booking was made the hotel tried to view my credit card details and said they were invalid, an e mail was allegedly sent to me but never received. I always use the same credit card to book with and there is no problem with it. They are not interested in what has happened to us, why oh why didn't someone telephone to double check the situation! This is the ultimate flaw with booking on line! We will never use Booking.Com again!