Hi @Daniela1586,
I am sorry to hear about your experience, and I understand that you’re frustrated.
I’ve got a similar experience as you, while Airbnb does not fully support removing the guest.
I have been forced to cancel the reservation to limit the risk of my home. I refund the remaining nights to the guest, apply the cancellation penalties, contact the local enforcement immediately, and proceed.
I am so sad and stressed hosting unwanted guests.
The ‘Resolution Center’ may help you to apply the additional guest fee and extra charge. The guest has 72 hours to respond. After the guest leaves, you need to wait for a few days more to involve Airbnb, look into the case, and prosecution for the payment.
It's necessary to prove the unregistered guest evidence and the photos of your home after they leave. The resolution center of the unregistered guest and extra cleaning fee immediately, before next the guest arrives.
The links are below to help to understand more Airbnb policy and services,
What should I do if I uncomfortable hosting someone?
https://www.airbnb.com/help/article/259/what-should-i-do-if-im-uncomfortable-hosting-someone#section...
What is a resolution center?
https://www.airbnb.com/help/article/767/what-is-the-resolution-center
About the review?
It's out of our hands! I‘ve over a dozen of untrue and revenge reviews.
The review can be removed unless it violates the Airbnb housing standard.
How can I remove and respond to a review?
https://www.airbnb.com/help/article/32/can-i-remove-or-respond-to-a-review-i-disagree-with
I hope you can resolve the issues and stay calm.