Amazon India — refund not received credited by amazon india

Address: Nainital, Uttarakhand, 263139

I purchased samsung galaxyM30 mobile phone Rs 14990 from amazon on 2/07/2019 and done full payment by debit card but order was cancelled on 4/07/2019 and now amazon is saying that refund has been send to bank account so contact customer service and file charge dispute they had given me Transaction id# 75503729187031083572352 and refund reference no. 712302
But customer service saying they can file nothing like refund reference number and can only check if money come to your account or not.. And bank customer saying there is no credit refund in your account. What to do..