[Resolved]  Punjab National Bank [PNB] — Track and returning the refunded amount

Address:

Punjab National Bank, Shakti Nagar, Jodhpur, Rajasthan - 342006

I, Rahul Singh Rathore, a joint account holder in Punjab National Bank would like to request you to help me in tracking down my refunded amount made by the Air Astana airlines.
I have booked 4 tickets from official website of airlines Air Astana on date 10th March, 2020 from my PNB international debit card. Due to Covid-19 pandemic it got cancelled by the airlines itself and the refund was made by the airlines on dates 14th and 17th August, 2020 of amount 406.82 $ and 452.82 $ respectively.
I have been trying to track down this refunded amount from last 2 months by coordinating with the bank but I am unable to do so as the bank claims that they haven't recieved any such refund but on the other hand the airlines have sent me proof of payment in form of transaction reference id's. And now when my father is going to bank to complain, the bank people are only making him go from one branch to another instead of helping us and solving our issue.
I request you to help me in getting back my amount.
Please find attached ARN number provided by Air Astana airlines.
I will be waiting for your response. My mail id is : medicos.[protected]@gmail.com