Punjab National Bank [PNB] — Refund initiated by amazon but still not received

Address:

Qtr No. 3057, Type-3, Sector-1, V F J Estate 482009, madhya pradesh

Sir
I ordered the 'Snow hill himalayan yak milk long lasting organic chhurpi Nuts for Men, Women and younger (100g/24-26pc) on 9-march-2021. it was to be received on date 18-march-2021. But I have returned my package. Amazon initiated the refund on 19 march 2021 and was expected to com on 24-march-2021.
Amazon gave me the reference id[protected].but the punjab national bank has still not credited my money. i contacted the pnb's customer care but they are saying they don't work on reference no. and it is not in there hands to do anything.
This is urgent please help me as soon as possible.