Punjab National Bank [PNB] — refund from online purchase from amazon

Address:

New Delhi, Delhi, 110081

I have purchased a book of rs 389 from amazon on 10/6/2018 and done payment of rs, 289 by debit card and rest from amazon pay balance, but order was cancelled on same day i. E on 10/06/2018. Now amazon is saying that refund has been send to bank. So contact customer service and file charge dispute they had given me a no. Refund reference# 75503728162020609346129.

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.