State Bank Of India [SBI] — taha did not got refund

To,
The chief branch manager,
State bank of india,
Main branch

Subject : charge dispute refund not processed

Dear sir,
A refund of rs. 543 was successfully processed on 1 october 2019 to my account by amazon.in. This amount should have been credited to my sbi account by now, but i have not received any refund till now.
I have called the state bank of india but not get any help.
I have confirmed with amazon and they have successfully processed the refund and reference number is[protected].
Kindly help me.