Air India — refund of cancelled tickets not received

I have given below my original web two way booking e-ticket for
3 persons booked to travel by your flight AI-655/656 between BOMBAY-RAJKOT-BOMBAY, going 28/11/20, return 08/12/20. The payment was made by American Express Credit Card.

​This booking was cancelled on 16/11/20 at 10.55AM over telephone[protected]. After this cancellation, I have sent many reminders for refund by emails. The last reminder is dated 22/12/20, More than 45 days have passed since I cancelled the subject 3 tickets, and I am sorry to bring to your attention that no refund has been received by me. I request you to look in to the matter on urgent priority basis and remit the refund amount.
eTicket Itinerary / Receipt
Issuing Airline : Air India
Place of Issue : www.airindia.in
Date of Issue : 05 Nov 2020
Booking Reference:
JQTFF

Passenger / Itinerary Details
Passenger Name Frequent Flyer # Eticket #

MRS ****************[protected]
MRS ****************[protected]
MR ******************[protected]

28 Nov 2020 16:30 hrs Mumbai (BOM) Rajkot (RAJ) AI 655 Air India
08 Dec 2020 19:20 hrs Rajkot (RAJ) Mumbai (BOM) AI 656 Air India
Detailed Itinerary

AI 655 Mumbai (BOM)
28 Nov 2020
16:30 hrs
Rajkot (RAJ)
28 Nov 2020
17:40 hrs

AI 656 Rajkot (RAJ)
08 Dec 2020
19:20 hrs
Mumbai (BOM)
08 Dec 2020
20:35 hrs

Payment Details
Base Fare Form Of Payment : CreditCard
3 Adult @ INR 12, 000 INR 36, 000 Name on Card : ******
Card Number : 376***xxxxxx2***
Amount Charged : INR 40, 785
User Development Fee (IN) INR 354

TOTAL TRIP COST INR 40, 785

VORA S.