My friend has a valid F1 and visited his mother country because of emergency. While he was staying in his country, international office of his university asked his thesis advisor about his status and to confirm that he is a student still. However his advisor said "NO"(he does not confirm his status since he does not like him). So, it seems that he may be out of status in the foreign student registration database. He can not come back to the States and also cann not apply any other visa. He tried to contact his advisor but refused to talk to him. Is there any way to know his status ? Is there any way to save him ?