Airbnb blocked calendar – reservation glitch

I have a guest attempting to book. Apparently she had paid the cost and completed the process on her end. But there is nothing for me to approve nor can I cancel it. The date is just blocked for no reason. Airb&b give me the run around by email without resolving the problem. I can’t seem to find a phone number to call them. It has been going on for a couple of weeks now. Airbnb is totally unhelpful in resolving what seems like a simple problem in their system. Anyone know of how to unblock a date or have Airbnb’s phone number?