State Bank Of India [SBI] — refund from amazon not received

Address:	West Tripura, Tripura
Website:	Amazon.in

I purchased a product on amazon by a seller named wsstore amounting of 1189 and the seller claims to have processed my refund on 2019/07/29 but upto this date of 2019/08/31 i haven't received any refund. I tried to file dispute charge on visiting bank but they are asking for transaction id and a lot more information which iam not provided with, the seller only gave me reference no for transaction which is[protected] but the bank says it won't work. Neither the seller or amazon nor the bank is talking action which is causing me problem to get my refund back. On similar to this case i purchased a product on amazon by a seller called aspire collection on 2018/11/30 amounting 452.41 and even after months to this date of 2018/08/31 i haven't received any refund and their reference transaction code no which is 359157 is not accepted by the bank.
The sbi customer care don't receive my calls, cut on receiving or talk hastily. I'm in need of serious help if you guys can help me i would be really thankful.

Kindly contact me at my mail [protected]@gmail.com in regarding the issue.
Help will be really appreciated.
Thanks you.