@Victoria1425 Airbnb does not require anything in the way of proof of ownership or permission from a landlord to sublet on Airbnb, which is ridiculous, so these things occasionally happen. And Airbnb is not known for being particularly responsive when this is reported.
But you do need to contact them, tell them it's an urgent Trust and Safety issue, and explain what happened.
It's quite possible that ad will disappear on its own soon before Airbnb takes action- how these scams usually work is that someone copies your listing, puts it up on another site, like Craigslist or zillow, then when some unsuspecting person who doesn't know how Airbnb works, and that you never send money, answers the ad, emailing back and forth with the scammer, the scammer directs them to either a fake look-alike Airbnb URL they have created, or briefly throws up an ad on Airbnb to seem legit. Once they get the victim's money, they then pull the ad, never to be heard from again.
If the ad is still up, it wouldn't hurt for you to send the scammer an inquiry message telling them you have reported their criminal activity in copying your listing and scamming guests out of their money and I bet that ad will disappear right away.