Booking.com complaint: Complete lack of customer care and co ordination

I originally booked this hotel for one night for the 12th November but brought my flight forward so went through the booking .com app to see if I could change the booking to the 5th of November , After three days of getting no reply I sent a reminder again through the app and this time I did get the reply that it was no problem and to the new date which I clearly did , When i arrived at the hotel on the 5th November I was informed that Booking .com had never been in touch to re arrange the change of dates and though I showed the hotel the re arranged booking date ation on my phone the hotel could not do anything until they received the change of dates from Booking .com; They phoned them ,explained the problem and asked for them to send through the ation . After waiting approx 4 hours and without a room the hotel suggested that i try to cancel the reservation and re book with them so I could get a room and de stress . This was done but at an increased price than B.coms ed reservation.