State Bank Of India [SBI] — refund never received for rs : 1798

Address:

Udupi, Karnataka, 576104

My sbi account details :-
Account holder :- parimendra pratap singh
Account number :- [protected]
Ifsc :- sbin0004426
Card number :- [protected]

Payment method : - debit card
Refund method :- original payment method
Email id : s. [protected]@ymail.com

I had made a purchase on amazon for which a refund was processed of rs 1798 for which the refund reference number was 960406, it was processed on 08 january 2019 but was never credited to my account, i already talked to amazon about it but they saying that amazon has already released the refund but it's stuck with your bank, please check this and get this resolved.
This is the email which i had got :-

" — forwarded message —
From: amazon.in
Date: wed, 9 jan 2019, 23:54
Subject: your amazon.in order refund reference number

Hello,

Your refund of rs.1796.00 has been processed successfully on[protected]. The amount should reflect in your account by[protected].

The authorization code (Refund reference number) for the transaction is 960406.

In case you do not receive the refund within 5 business days, please contact your bank’s customer care and mention the above authorization code (Refund reference number). Please remember that you will have to call your bank’s customer care center and not visit the branch for this query.

Some nationalized banks may take more time than usual to credit the refund. If your bank is unable to locate the refund with the authorization code provided, please dispute the transaction as 'refund not processed'. On disputing the transaction, the bank will see a pending refund and will follow the path back to our payment processor to locate the refund.

Hope this helps. Thank you for choosing amazon."