Air India — AirIndia Flight Refund Not obtained

Had booked an AirIndia flight ticket through Travelopod agency from Coimbatore to San Francisco for $1345 ( Details shared below) . However I reached out to Air India Folks to cancel my ticket before 24 hrs of departure and I have been told that as per the latest AirIndia Airline rules, am eligible for a refund after deduction of Rs.2500 and 5% GST charges which would get credited back to my credit card which was used to bill at the time of transaction. I still haven't received the credit back to my account and I have been following up multiple times with the travel agency has well.

Coimbatore (CJB) to New Delhi on Wed, Nov 13, 2019 departing at 2:10 pm
Operated By: Air India Charters Limited - 9018

New Delhi — San Francisco on Thu, Nov 14, 2019 departing at 4:00 am
Operated by Air India 173

Its been more than 2 years now and appreciate your quick help in this regard