I obtained a message from the hotel. None problem with my bank card, but "a system error". Probably nobody is liable for this situation. It makes a fool of me, I won't tolerate this. The fight is go on..
"We feel sorry about this situation but your booking was part of a system error explaining the extremely low rate you booked for the property. On this period the rates are higher than 200€ and for this reason Booking.com cancelled the booking. This is not an illegal act as the rates are so low that it does not cover the fees for the breakfast. We feel sorry about the situation and this mass issue that happens and we thank you in advance for your understanding."