Punjab National Bank [PNB] — payment not credited till now to my account

I have purchased earphones of ₹848 and pressure cooker ₹1997 from amazon on 20.12.2019 and done full payment by debit card but order was cancelled on same day 20.12.2019 and now amazon is saying that refund has been sent to your bank so contact customer service and file charge dispute. They had given to me reference number 854302 and[protected] but customer service is saying that they can file nothing file charge dispute and can only check if money came to your account or not. Same behavior by branch also.
Now don't know what to do. Please credited my account with the amount asap.