Booking.com is unreliable and ruined my holiday

I am very dissapointed in the reality of booking.com. I booked accommodation at an establishment on 4 Nov. The booking was confirmed. On 7 Dec I contacted the host. She enlightened me that she received no confirmation, as I did not pay, although booking.com required my card info to book the place, and said the debit order will be taken on 8 Dec. So I phonee booking.com where a man informed me that I should not worry, they will accommodate me if the host can not honor the agreement. They only gave feedback 4 days later, quoting me 2500 extra for another accommodation. I declined as I took it apon myself to find new accommodation. The bad thing is, they could only accommodate us for 3 of the 4 days we originally needed.Okay fast forward. Booked at another establishment listed as having a sale on booking.com. i booked, paid immediately, only to let the host phone me and tell me the establishment is fully booked, he does not know why booking.com even advertised. Really? 2 f-ups in one month? What should have been the perfect holiday for my family, is now stresful. I will not trust booking.com evee again!