Bank Of Maharashtra — issues with refund

My refund hasn't arrived. It has been like 7 days. This is completely preposterous.
Here's the email from amazon:
Hello

This is to confirm that refund for amount 19998.00 has been successfully processed on[protected] and the amount should reflect in your account by now.

Refund reference # 5s9iq29w0000k5pccwnx

Please contact your bank’s customer care center and quote these numbers to know further about the status of the transaction in case you still haven’t received the credit within 4 business days. Please remember that you will have to call your bank’s customer care center and not visit the branch for this update.

Some nationalized banks may take more time than normal to credit the amount. If your bank is unable to locate the refund with the reference number provided, please dispute the transaction as 'refund not processed'. At that time, they will see a pending refund and will follow the path back to our payment processor to locate the refund.

Thanks for choosing amazon