Air India — Tickets refund issue

My name is Rajesha Navile Basappa, I was booked air tickets for me and my family on 21st May 2020 through Air India Website to travel from domestic flight from Bangalore to Delhi and international flight from Delhi to Sydney later I cancelled them due to Government again postponed domestic flights flying dates so I cant travel to Delhi from my native place. I sent many requests for refund, every time they told us refund will take time, it’s almost 1 and half year still we waiting. Now I am not able to send mails and not able to contact them. I paid nearly $7000 Australian dollars. Please help me to resolve this problem. Because of covid -19 I am already facing financial issues in my family.
Looking forward to hear you back.
Flight details :
PNR number:H5YHJ
Usha Chandrasekara : e-ticket[protected]
Saanvi Raj: e-ticket[protected]
Nirav Navile Raj: e-ticket[protected]

PNR number:Y9MJB
Rajesha Navile Basappa: e-ticket[protected].
Thank you
Rajesha