In your comments you stated that there were no red flags. My 1st red flag would have been "travelling a long distance to host a 14yr old birthday party for 4 or 5 kids with 2 chaperones. That in itself is a huge flag in my books.
How many chaperones do you need for 4 to 5 kids, OH sorry we need chaperones to legally purchase alcohol.
I must be old fashioned , Teenagers needing private party venues never happened in my growing yrs.
Sorry for your issues,
1 message guest and ask them to leave immediately, (do not wait for response)
2. Cancel booking with no refund on ABB app (message them to deal with it also message that you will be attending eviction with local law enforcement.) Then
3 Call the local law to attend with you to the house to supervise eviction,
4. Once they are all out collect keys change lock code (or whatever you need to do to secure your property) Arrange for a security company to monitor the house for 24 hrs then go home and try to sleep
Next Day:
Go on App and read ABB response to your request, tell yourself that they a a heap of no hopers and get on with life.
PS, There is no SWAT , there is no Host Guarantee (well maybe a little after you have pulled all your hair out , jumped through multiple hoops, and paid out of your own pocket just for your sanity.)
Have a great day a wonderful christmas and New Year,
PS Dont host any more parties.
Be your own boss, dont let ABB incompetent staff and algorithms control your business.