Bank Of India — online payment refund

Address:

Hazaribagh, Jharkhand, 825316

Dear sir/ madam
I didn't get the refund amount till now
Actually i booked order through amazon 20.06.2018, amount 885/ but i cancelled the order on 25.06.2018

but when i asked bank regarding the refund they said to me that the ref* number which i provide to the bank is not vaild .
when i asked amazon they said that please file a charge dispute

So please requested to you i want to file a charge dispute that the amount is not credit on my account till now .

Regards
jaideep banerjee
account no- [protected]
ifsc code - bkid0004820