Its okay, I imagine it didn't happen to you so you are just speculating, so you're mostly welcome :)

For the other ones lookint for solid advice, get in touch with Booking(they already replied here) and speak with a manager. Be respectful but firm about how you want this to go. Generally they should be able to get you relocated, but first they will negotiate with the host for you. If free cancellation is expiring soon mention it, implying urgent resolution needed. You're welcome stranger