Amazon India — about the refunds

Website:

www.amazon.in

We have ordered a guitar from amazon... Since it was not good. We have asked for the refund... But till now we didnt receive the refund though it was ordered about 7-8months ago. When asked the amazon constumer care no.. They said we refunded. But on contacting the bank.. They said there was no such transaction happened from amazon.
A ref id hsbcn[protected] of order id[protected], is the only thing that has been provided by amazon making it impossible for the banks customer care to track the required details of the transaction and thereby making it impossible to file a complaint of 'charge dispute' against the given ref id.
Amazon is blaming the state bank of india for denying the service whereas on the otherhand bank is claiming that they don't have the enough details to take up the case.