Airbnb Refuses to Admit System Booked Twice

Has anyone else been double booked by Airbnb? I booked a property in Austin after researching various properties. According to Airbnb, eight minutes later, I booked one of the other properties that I had looked at. I received no notice of the booking and only saw it on my credit card statement after 48 hours. The host and Airbnb are only willing to refund half my payment for the extra property. The Airbnb representative was very insulting and insisted that I would have had to have gone to the second property’s page and clicked on the “Book” button. This didn’t happen. When I asked why would I have done that when I was already finished he said, “Well, I can’t speak to the psychology of why you would do that.”