Bookings.com has careless attitude for their clients

Booking was done and paid through Booking.com for holiday accommodation at Dux-a-biki. A confirmation number was received. On my arrival at Dux-a-biki, I stood all embarrassed to find out that they are not aware of my booking. Dux-a-biki tried to contact Booking.com, but was unsuccessful. I had to make last minute arrangements for other accommodation. We tried to contact them to get a refund, but no reply