Hello Fernando and welcome to the forums!
You typically have 2 options when it comes to a stolen license.
1) Contact the Autodesk License Assistance team and request that a new one be generated and the old one be inactivated. As you're already here you can do so by simply sending me a Private Message (click on my philip.s profile name and then "Send this user a private message") with your serial number.
2) Report the issue to the Autodesk License Assistance team and request an activation code and that a note be added to the license. Any subsequent activation requests would be blocked by a user other than the registered party.
Please accept as a solution if this fully resolves the issue, or reply with additional specifics as needed.
Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register