Syndicate Bank — refund not credit on my account

Hi,
I ordered and returned a product to amazon. I made payment with my debit card on 4th oct 2019, amount is rs599. But it was not credit on my account. Amazon customer care they told to submit the charge dispute form to be submitted to amazon and gave the refund reference # 1cw7mjl60000k19ytv5h gave the same to syn bank they said they did but money was not credited still.
Kindly do the needful