First, file RTI application or make a complaint and get all evidence in the form of documents (Certified copies).
After getting such documents, issue a registered notice to Bank reporting such fraud and demand for crediting such fraudulent amount withdrawn from the account.
Wait for a month, and then file consumer complaint before District consumer forum.
and also file online complaint to Banking Ombudsman against the Bank.
The mandatory requirement is that customers should give notice, demand for crediting the wrong debited amount, and in the complaint, a request should also be made to Bank to file a police complaint.