Airindia — Refund Issues

BOOKING REFERENCE: SMRDU3
TICKET NUMBER: 098 [protected]

I checked into flight No. AI934 from Dubai to Kochi Flight on 21.10.2022, Due to maintenance issues with the flight, they canceled the flight for that day. They suggested going for cancellation, full refund amount will come to the account. I have applied for a refund ONLINE. But I received less amount. since it's NOT a fault from my side. Need full refund amount for the same.

Wrote a mail many times, but NO responses... No picking up calls in customer care.