Remember, USCIS officials will never ask for payment over the phone or in an email. If we need payment, we will mail a letter on official stationery requesting payment.
If you receive a scam email or phone call, report it to the Federal Trade Commission at http://1.usa.gov/1suOHSS. If you are not sure if it is a scam, forward the suspicious email to the USCIS Webmaster at email@example.com. USCIS will review the emails received and share with law enforcement agencies as appropriate.
-- USCIS Public Engagement Division