Amazon India — Refund is not credited in my account from past 1 month

My name is Dhruv Mittal and i have order an earbuds ( sony WF-C500) worth
RS of 3150 only from amazon on 13-OCT and i returned this order due to missing item. And on 10-Nov Amazon initiated the amount to my bank account but I still didn't get my money back . Amazon sent this reference number (#[protected] and when i told them they are saying me to fill charge dispute against the bank but bank does not have such policy . so please kindly respond to this complaint . it's been a long time now .

Thank you sir