Indian Railway Catering & Tourism Corporation [IRCTC] — not refunding for flights that get cancelled by the airlines

I, Aishwarja Nath, booked a roundtrip ticket of CCU-DEL-CCU but the airlines Air India canceled the flight AI-764 of DEL-CCU on 9th November 2019 time 16:55 with PNR Number HEDWQ and transaction no [protected] and give us one computer copy for full refund which is attached herewith.

I mailed previously and got a reply from IRCTC stating that the refund will be done wihin 7-8 working days on 14.11.2019. Then again I mailed on 29.11.2019 and got again a reply from IRCTC stating that the refund will be processed within 4-5days. I still didnt get the refund and its been more than 14-15 working days. This is the fifth time I am writing to you and everytime I am getting reply to wait. And this process almost took 1 month. Everytime I call on your Customer Service number, the assistants are ready to give nonsense reply which doesnot make sense.
Thanking you,
Aishwarja Nath
[protected]@gmail.com
[protected]