Punjab National Bank [PNB] — regarding refund from amazon

Address:

Lucknow, Uttar Pradesh, 226028

Hello
I ordered the product from amazon but due to continuous delay in reaching of product i cancelled the order.
I claimed for the refund and the claim process had started on[protected].
The amount of rs 7497.90 was to be refunded within 5 days to my bank account (Punjab national bank) but it is been 10 days now, there is no refund.
I am continuously calling amazon for assistance they cleared me that they have initiated the refund and suggested me to approach to pnb for refund.
I now started sharing my grievance to pnb pertaining to the refund but they are saying we cannot do anything even they are not taking the arn or the reference number to check the details.
I requested them to tell me how to raise the transaction dispute but again they rejected to provide me the detail to reach the solution.
I request them to solve the issue as soon as possible and i also demand stringent action from government so as for the hassle free services to the customer.