Punjab National Bank [PNB] — Payment not received

Address:

Punjab National Bank, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal, Pin- 741252

I am Shoumik Saha. I ordered a book named SURA'S AIIMS NORCET for rupees 450 on 20th April 2023 from Amazon, then I returned this product dated 28th April 2023 for a personal reason. Then Amazon has initiated the refund and claimed that they have refunded it within 1-3th May 2023 in my Punjab National Bank Account, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur. When I checked my bank account statement no such refund was there for rupees 450. I have called customer care at Amazon and they have provided me with a Refund Reference Number (RRN) as[protected] and told me to contact the bank. I have contacted PNB B.C.K.V branch personnel and also with the customer care of PNB. They have told me clearly that they can not take any complaint on the basis of the Refund Reference Number, and no such refund can be possible on the basis of the Refund Reference Number. I want my refund of 450 rupees back as quickly as possible. Please kindly respond to this complaint.