Punjab National Bank [PNB] — refund not get

I purchased virgin coconut oil and castor oil ₹683 from amazon on 03/01/2019 and done full payment by debit card but order was cancelled on 4/03/2019 and 5/03/2019 and i got 139 rs in my card, i din't get refund of 544 rs, now amazon is saying that refund of 544 has been send to bank, so contact customer service and file charge dispute they had given me a no. Refund reference #[protected].
But pnb customer service is saying they can file nothing like charge dispute and can only check if money came to your account or not.
Same behaviour by branch also. Please provide my 544 refund.