Hey as per my idea you will get a form through which you can give your complaint in Hindustan Petroleum

Here I am giving you process of getting Hindustan Petroleum Online Complaint form
Go to official website of Hindustan Petroleum
After that at top of home page you will get about us
Under that you will get overview
On that page you will get governance segment
Under that you will get Vigilance
Then you will get Vigilance Complaint
On that page you will get complaint form



Address
Chief Vigilance Officer,
Hindustan Petroleum Corporation Limited,
Petroleum House,
17, J Tata Road,
Churchgate
Mumbai-400 020.