Cancel a crossed over booking
I have my property advertised on 4 sites, and the calendars are sync'd between all four. This has worked fine for nearly two years. However, I just received a booking on booking.com for a September date, where those dates are already used by another site. The date, it seems, hasn't sync'd to booking.com. Its not the fault of the other site, as that booking shows up on all the other sites I advertise through, including my sync'd calendar on my phone.
All my other bookings for the other sites have sync'd to booking.com's calendar fine. Its just this ONE booking, and its the one causing a problem.
I have messaged the booker, asking if they'd cancel or change the dates but they haven't respoonded (funny enough, I'm aware a lot of people don't seem to receive messages through their booking.com account, but thats an issue for another day).
Any other suggestions as to what I can do?