Punjab National Bank [PNB] — refund problem

Address:

Jaipur, Rajasthan

I purchased shoes of puma from amazon but after that i returned shoes. But i haven't received any refund in my account. And now amazon costumer service executive are saying that the refund initiated to your bank account.
I bought that shoes of rs.1899.00/-
Amazon costumer service executive are saying to file a charge dispute form.
But customer service is saying they can file nothing like charge dispute and can only check if money came to your account or not.
Same behaviour by branch also.
Don't know what to do
Ac. No. [protected]
Aditya yadav
Ifsc code punb084700