Indian Railway Catering & Tourism Corporation [IRCTC] — refund against cancellation

Address:

11 21st Main, 5th Cross, JP nagar 2nd Phase, Bangalore, Karnataka, 560078

The following refund not credited in my bank till date, despite many reminders.
I had also sent my bank statement as requested by them twice. Everytime, i get a automated mail that:
We would like to inform you that your below-enclosed email has been again forwarded to the concerned department. You will receive a reply in this regard shortly.

Details of the refund not credited to my account:
Date of cancellation of e-ticket/: 29-apr-2019
Refund processing date: 01-may-2019
Refund amount: 520.0
Refund reference no: [protected]
Payment option used : credit cards/ debit cards / upi (Powered by irctc) (Aggregator)
Booking reference no: [protected]