Punjab National Bank [PNB] — refund never processed from amazon.in

Address:	123303
Website:	Amazon.in

I ordered a product on amazon.in on 21 april and made payment through upi,, due to some reason i cancelled the order. Refund was made from amazon.in on 8th may and it has to reflected in my account by 15 may but the refund is recieved in my account. Amazon.in provided me with a refund reference #[protected]. And asked me to go in the bank and file a charge dispute but the bank refused to do so. My bank account is in pnb. Plz make any solution for this problem