State Bank Of India [SBI] — refund is not processed yet from amazon to sbi

I made a payment of Rs 1165 to amazon on 23/06/2019 by using sbi debit card to book a watch. But amazon deliverd it to wrong address, so I complained about it to amazon. So, they confirmed to me to refund my all money i.e. Rs 1165. They initiated the refund on 30/05/2019 as I received an email from amazon. Now, amazon is saying that refund has been send to bank. Amazon also shared me the Refund Reference Number[protected] for the refund transaction. So, I contacted to bank's customer service using this refund reference number but customer service is saying, they cann't give any information by this reference number and can only check if the money is credited into your account or not. Same behaviour by branch also.
Don't know what to do.