Indian Bank — haven't received my amazon refund amount yet.

Address:

Vishakh m v, Mupliyath house, Thrissur, kerala, 680004

I have cancelled my amazon order on 18 th august. And amazon has initiated the refund on same date. And the money was suppose to get refunded on 23 rd august. But i haven't received my refund yet
Amazon has provided a refund reference number. But the bank refused to help me with reference number. The bank was asking for utr number. Which amazon was not giving. I want my money back.