State Bank Of India [SBI] — refund charge dispute

Sir,
I requested for refund for an online purchased product through Amazon and refund was issued on 21.05.2019. But the amount was not credited in my Bank account till date. On enquiry, at amazon, it was informed to contact bank customer care with Refund refrence number 213186. I have many a times contacted the customer care even contacted the branch for refund. But the bank authorities denied to accept my request, so that I cannot file refund charge dispute at bank, as informed by Amazon authorities.
I have a SB account at SBI Vikas Bhavan Branch, Trivandrum with Account number [protected].
I request to do urgent necessary steps to trace the uncredited amount by accepting my refund charge dispute and kindly credit the refund amount of Rs. 999/- to my account.
Please note the refund reference number:- 213186

Account number [protected]

Regards
Praveen.V