Try emailing these:
Fraud Prevention Unit
You may confidentially report visa fraud by email. Be as specific as possible. Please include the person’s name, date of birth, and passport number as well as your name and contact details. Email: mumbaif@state.gov.
Lost or stolen Passport With a U.S. Visa? If your passport is lost, stolen, or missing, immediately contact the U.S. Embassy or the Consulate General that issued your visa with details of a formal police complaint, passport, visa information, and your contact details. Email: mumbaif@state.gov.
Report Criminal Activity
To report criminal activity associated with U.S. visa or passport fraud, wanted U.S. fugitives, human trafficking, or document vendors, please email: mumbai_visa_fraud@state.gov.
Individuals providing tips to the consulate may remain anonymous. Should you wish to speak with a Special Agent regarding your tip, please provide your name and phone number.