Air India — Regarding refund of air ticket

Address:

31255 upper maclure rd #37, abbotsford bc v2t5n4

Me and my family booked ticket from vancover to ahmedabad and return ticket, but due to covid air india unbale to provide return service from ahmedabad to vancover so they are cancelled that ticket, so we travel from other airways, now air india not provide me refund for my cancel travel
so please provide me my cancelation ticket refund
further that all document i will provide you,
trawel date 24th april 2021

ref E- ticket number exchange ticket number passenger name

[protected] [protected] Makwana Aarya Jitendra Kumar
[protected] [protected] Makwana Gitaben Jitendrakumar
[protected] [protected] Makwana Jitendrakumar Dudhabhai
[protected] [protected] Makwana Pavitra Jitendrakumar
[protected] [protected] Makwana Uttara Jitendrakumar
[protected] [protected] Makwana Sati
[protected] [protected] Makwana Yajnesh