Punjab National Bank [PNB] — refund is not credit in my account

Address:

Premnagar, Dehradun, Uttarakhand, 248007

I ordered a product from amazon on 21 august 2019 due to some problem i return it to amazon and then amazon said the refund amount rs 210 will transfer to your bank in 5 to 6 days so on 26 august 2019 the mail came from amazon that the amount is transferred to your bank and the refund reference no. Is # 75260829239032631950057 but when i make a call to bank customer care regarding this issue he said i didn't help by this reference no. And ask your merchant (Amazon) and amazon said i already refund it the fault is from bank side. So please help me regarding this