Bank Of India — refund is not credited to my saving account

I am having saving account at Bank of India.

I paid ₹4196/- via Bank of India debit card online on 24th August 2018 to Amazon. (Transaction ID generated as "MEDR/Amazon Pay/717756"). Since there is cancellation of one order in that transaction, I have requested for a refund of ₹2198/- on Amazon website. As per their records, it's credited to the bank on 9th September 2018. I haven't received it yet.
As per the telephonic conversation with Amazon customer care representative, reference number for the refund transaction is quoted as "75503728253022778806016".

Please look into the matter and give me proper resolution. I have called Amazon Customer service, Bank of India call centre, Home Branch for the same matter. I have not received a satisfied answer when I called Bank of India customer care number twice today. First on [protected] and later [protected]. Since as per Amazon Leadership Resource person, I can trace my refund or file "Charge Dispute" online calling customer care I called twice. They didn't give me a proper information. I have tried lodging a complaint on Online Grievance Form through the link recieved via email 2 days back. http://www.bankofindia.co.in/english/GrievanceForm_pg.aspx But its showing error as enter valid account number.