Citibank — Tax Evasion and money laundering

I have reported a case of money laundering where a team leader has been using surrogate bank account of her brother and used her sub ordinates to deposit money. I have documents which shows outstanding tax dues of 8 employees as Rs 4 lacs. While reporting the same on pmo portal Mr John Koshy who is a Regional nodal officer says it's a private bank. Write directly to us. I have sent 100 e mails but no response.