Reserve Bank Of India [RBI] — spam messages from rbi

The email id mentioned above is misusing rbi's and foreign exchange dept.'s name.
Actually the email id mentioned above sends me the email and says that i have won 5billion pounds and rest the # you know.
I also have a proof of the email send to me.
Please share any way so that i may show you the proof and let them stop from misusing your name and stop them to make our country's reputation down.