Thanks Emiel1, we actually booked back in July 19th, and Check-in date isn't until Dec 27th. So 48-hr grace period doesn't apply, but it still seems pretty black and white: "Cancel before 4:00 PM on Dec 13 and get a full refund. After that, cancel before 4:00 PM on Dec 22 and get a full refund, minus the service fee."
I'm just glad I kept the confirmation email as proof. AirBnB won't respond until 72 hour prior to check-in, so we have to wait until Dec 24 to resolve this issue?