The first twenty-four hours after a bank fraud are the most important for the victim of the fraud. The customer should immediately inform the bank of the unauthorised transaction, so that the accounts can be frozen and further debits stopped, and should obtain a written acknowledgment of the complaint that is lodged with the branch.
A complaint should also be lodged with the local police station or with the cyber cell, and the complaint number should be preserved for reference in the matter. For fraud that is committed over the telephone or through an electronic channel, the National Cyber Crime Reporting Portal and the 1930 helpline, which feed into the Reserve Bank of India's reporting mechanism, are the correct channels to use.
The customer should preserve all of the digital evidence, including SMS messages, emails, transaction references, call logs and the receipts of the payments that were made. These materials are what the bank, the police and ultimately the court will rely upon in order to establish the fraud and to trace the funds that were lost.