Goibibo Indigo - No Refund

I Booked * flight tickets for double passenger on **rd May of IndiGo airline through Goibibo agent.
During lockdown flight got cancelled and credit shell was made if ****.

Now i want to use the credit shell and book a flight with single passenger but they are not allowing me to do so giving a reason it was made on double passenger so you can't use .
Their are possibilities that other passenger planned been changed or might not be available kr might not be alive even.
SO still **% amount i should be given to use.
But no response Goibibo is telling talk to Indigo and Indigo telling to talk to Goibibo.

Really Pissed off