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Cancelling a double booking

Last night, Airbnb glitched and opened dates I had blocked for a direct booking. After three hours they finally cancelled the double booking, and did their usual thing of blocking the calendar for the dates of the double booking, which was fine as my original guest would be there anyway.
This morning I woke to find a double booking on for the same dates. Despite my calendar being blocked on Airbnb, the syncing hasn't worked, or my calendar was unblocked, and now I have a booking I can't take.
This is urgent, and I see that I don't even have the option to cancel the booking myself.
Can someone please help?