I have sync all my calendars and had several problems with Booking.com over the summer due to double bookings so eventaully closed the calendar down for the summer to avoid it happening. I use airbnb and homeaway and have all calendars synced and no problems with the other sites.
I have checked that calendars are synced and opened up booking.com again as I do get most of my booking through them but I have got another booking for August next year which is the same dates as and airbnb booking that came in two weeks ago.
I have tried to contact booking.com but not had a response and the number they give is impossible to get through on. Any advice what I need or should do?