11th June 2018
This is very non- traditional , outlandish requirement of your boss bordering on idiosyncrasy.
He is not accepting your verbal submissions and wants you to write an email justifying why you should be given increment.
So write to him stating your achievements during this period supported by facts and figures. Be confident and do not hesitate to ask for raise commensurate with your contribution.
Leave to him and be cool.
12th June 2018 From India, Mumbai