Indian Bank — not received the refund amount

Address:

40, DR PK BANERJEE ROAD, MULLICK FATAK, Howrah, West Bengal, 711101

I have ordered mi 6a mobile from amazon on 18/6/19 by making payment of 5999 through indian bank debit card. I have cancel the item and amazon initiated refund on mi 6a with refund reference number 224880 and my order id is[protected]. They even share the transaction id on my registered email id. I also visited bank branch, they deny about this transaction. When i contacted amazon, they requested me to file charge dispute against indian bank customer care... According to there term and condition the amount should be credited within 4-5 working days, which already has passed. So please kindly look into this matter as soon as possible..