Punjab National Bank [PNB] — no refund by punjab national bank

Address:	110094
Website:	www.pnbindia.in

I have purchased a product from amazon on 10th may 2018 and refund of rs.1148 has been processed successfully on 5/10/2018. The authorization code (Refund reference number) for the transaction is 352410. But my account not showing the amount. They are telling charge dispute but bank said they cannot do this. Wht should i do. Pls solve this prblm and get my money back.