Trending @Accenture; Resignation Early release

I have submitted resignation due to genuine medical reasons. Currently doctor has advised for bed rest for a month. I have submitted medical certificate from government medical officer (cmo). But manager is not satisfied and want more documents..

I have email him with HR in CC stating my points.

How to get early release? Issue is genuine and approved but manager wants more documents. Doctor follow a standard format hence we can not ask them to change.