Hi @Gabriel4132
It sounds like you have already reached out to the guest and they are ignoring you. Have you submitted a claim here: https://airbnb.com/resolutions?
It is best if you have proof of the extra guests, especially if you have an extra guest fee setup in your listing details. If the guest ignores this or declines the request, then you can go back to the Resolution Center where you made the claim and there should be a button to Involve Airbnb. If it gets to this, click on that and then an Airbnb Case Manager will be assigned and will usually investigate.
Good luck!
David
Superhost Ambassador ~ Host Club Community Leader ~ Experienced Co-Host