State Bank Of India [SBI] — charge dispute of rs 499

Hi,
A refund of rs 499 was processed to my account from amazon but i haven't received it till now. I've checked the bank statement also but still nothing is credited to my account.
I even talked to the sbi customer care with the authorization code (Refund reference number) amazon provided but they ask me the utr number which by security reasons amazon denied to share.

Several times i tried filing charge dispute but they are not filing it. They say it's a third party thing and we can't do anything about it.