@Peter144, if your house was being rented out by the tenant without your knowledge, you should contact AirBnB immediately.
You can reach them via the Help link at bottom of this page.
Or via Facebook.
https://www.facebook.com/airbnb/?fref=ts
Or – if you have a Twitter account - try twitter@airbnbhelp. It’s said there’s a quick response.
The list here contains a link with several international phone numbers (‘How to contact AirBnB’).
https://community.airbnb.com/t5/General-Hosting/Community-Help-Guides/m-p/23100#U23100