HonzaZ,
Thanks. Let's me just explain that "siteseguro.ws" is a common suffix that a lot of websites hosted at LOCAWEB work with shared hosting. Our website is "flip.siteseguro.ws" and we don't know any other website *.siteseguro.ws. In that case we asked for locaweb to review and block the website "tecnico.siteseguro.ws" and that's what they did.
Thank you again.