Karnataka Bank — Refund not reflected

Respected sir/Madam

RAMESH G BHADANKAR
Account number : [protected]

Reference number :
SAJJ Z9UH 0000 KS7Q CWHA

I ordered one product on Amazon that cost of ₹ 3596, The refund initiated on[protected] it should reflect in bank account within
[protected] it's already has become 3-7 working days still I haven't received my refund amount, I contacted Amazon customer care they sent reference number to me, from there end amount has been credited. So I contacted Karnataka Bank customer service and also I visited Karnataka Bank, I didn't get any solution from there end. Here I am attaching reference number which was sent from Amazon customer service center.

I hope you will help me in this regard.
1) Date of transaction:[protected]
2) Transaction amount: ₹4115 but I should get ₹3596
3) Refund mode : debit card
4) Refund Reference Number : SAJJZ9UH0000KS7QCWHA
5) Refund Date :[protected]
6) Refund initiated Bank Name : Amazon.in (Ecom)
7) screenshot of the communication received from merchant bank:

Thanks and Regards