Punjab National Bank [PNB] — irctc refund not reflected in my bank account

I had booked two tickets from irctc through debit card. But due to some reasons i had to cancel the tickets. Irctc says that they have processed and refunded the money to my account so i should contact with my bank and file charge dispute form. I had contacted the bank but they say they do not know about refund reference number or charge dispute. Please do the needy and refund my money immediately. My account details are as follows:

Account name: shivani gupta
Account no:[[protected]]

My tickets details areas follows:
Ticket 1:
Pnr number [[protected]]
Irctc transaction id [savita03gupta]
Date of cancellation of e-ticket/date of failure of e-ticket booking:23.01.2020
Refund processing date:25.01.2020
Refund amount:750
Refund reference no:[protected]

Ticket2:
Pnr number [[protected]]
Date of cancellation of e-ticket/date of failure of e-ticket booking:27.01.2020
Refund processing date:28.01.2020
Refund amount:885
Refund reference no:[[protected]]