Longterm capital loss

I am holding few (scripts)shares in my demat account also some scripts as physical, can unable to dematerialise as the company disappeared from the system, no contact points, for these Shares I am holding them for a long time because of unlisted & untreatable stocks.

Please guide me how to book my ( LTCL) losses under Income Tax act. Like me many more small investors are facing the issues, Hope you as last point of contact to reach for a permanent solution Please reply as early as possible.

There is no clear reply from CAs, too.

Awaiting your reply at the earliest.emphasized text

Thanking you,