Ibibo Group / Goibibo — Refund not received even after the airlines provided the refund on Dec.2020

Dear sir/madam,

I am a 61 year old senior citizen, I booked a flight to visit my son last year through Goibibo www.goibibo.com/.
My flight was supposed to take off from MAA-FRA (Chennai-Frankfurt), FRA-MUC (Frankfurt-Munich) on 5th of May 2020 and the return was planned on 5th of June 2020 from MUC-FRA (Munich-Frankfurt), FRA-MAA (Frankfurt-Chennai).

Unfortunately due to COVID 19 pandemic, the flight has been cancelled. When I tried to contact Goibibo through their Customer Service, it was not possible.
I tried multiple times for many months (more than 8 months), but the line did not go through almost always.
Even the few time it went through they said it is in process, but till now i did not get any refund.
I also tried to email them to their email address but there was no reply.

As last resort, I tried to contact Lufthansa, the airline from which the ticket was booked through Goibibo, they said the refund has been provided already to Goibibo on December 2020.
I still did not get any response from them or I cannot contact them.

I would kindly request you to please provide me help and support to get my refund. Being a senior citizen and just a tuition teacher, this money is very important to me and my survival during this difficult time.

My PNR ID from booking is: U4VRKG
Name: Srivaramangai Padmanabhan

I would be happy to provide any further information to process my request. Also attached the copy of my flight ticket herewith. Looking forward to your kind help.

Thanking you,
Srivaramangai Padmanabhan