Ibibo Group / Goibibo — Credit shell problem

Address:

GOIBIBO

Hi am saravanan
I have booked ticket of indigo airlines thru goibibo, travel date was june 11 2020
From mumbai to tirchirapalli but the flight was cancelled by indigo airlines because of covid lockdown issues, i have received the ticket amount as credit shell

Now i want to use the credit shell for my new booking, previously i booked ticket for my family me, my wife and my son, now i want to travel alone for my work

First there is no option of credit shell in goibibo payment page
Another option that mentioned from goibibo website like
From the (My trip) page, there you get to book with same passengers list like me, my wife and my son, now i want book ticket with my credit shell only for me because of covid reasons i don't want my family to travel with me
Pls help me to book my ticket