Goibibo — Not refunding my air ticket booked for travel during COVID

Address:	Goibibo Good Earth City Center Sector 50 Gurgaon pin 122018 State Haryana
Website:	travel@goibibo

I had booked a return journey air tickets from Trivandrum to Chennai for travel on April 9 and return on April 13, 2020.
Due to the lockdown imposed following COVID pandemic the airlines had put my tickets in credit shell with facility to rebook it on dedired dates before March 2021.
I have tried several times to rebook the ticket and sent mails to the travel agent. I have tried to reach theem on their customer care number which to my sismay has been shut down. When I contacted the concerned airlines Indigo and Air India for booking the tickets they had directed me to get it done through the travel agency Goibibo as I had booked the ticket through Goibibo. Despite seveeal attempts to reach Goibibo I am not getting any response from the travel agency.