Amazon India — not received amount

I bought a product order no.[protected] from amazon and payment with cod due to some defects. Product returned on 19/08/2019 and for refund i gave bank account number and ifse code i. On 20/08/2019 there was a mail amount of ₹349 the refund was initiated by amazone and has also given a reference number[protected]. But my account has not been refunded.
For this i got contact in my branch but he did not give any information and he flatly refused. And both amazon and bank of india are denying their responsibility

Name sajid ansari
Ac no (Boi) [protected]
Ifcs code bkid0004864
Amazon reference no.[protected]
Order no.[protected]
Payment mathod cod
Amazon email i'd. [protected]@amazon.in

My mobile no [protected]
Email id: [protected]@gmail.com