Indian Bank — Refund not credited yet from Amazon

Address:

Nagpur tiranga square branch

I bought wow oil combo from amazon but that one item was missing in the package so they did refund for my issue I got my refund from Amazon but still not processed in my bank account Amazon geve me refund referance number that is. VCZQYALA0000KVA6F01E
I have already contacted bank for this issue but they said that IFSC code of bank was changed because of bank name was changed so that's why they are unable to process my refund please investigate my issue and credit my refund as soon as possible