This is the 3rd such post in recent times.
I wonder what’s happening… 
Why is everyone buying SDLs without considering there is hardly any liquidity on secondary markets! 
Anyway, checkout this topic-thread where this scenario was recently discussed.
To get rid of illiquid bonds in a hurry on the secondary markets (NSE/BSE)
the strategy is to basically offer all the bonds one is holding
and sell-off whatever quantity (even part of one’s entire holdings) one can
at progressively lower rates (even lower circuit limits),
as circuit-limits reduce each day after a trade occurs at a lower price.