Canara Bank — refund not received from the amazon from the last one month

Address:

302025

I have done the transaction on the 27 of dec 2017 for the leather jacket and i also return that but i did not receiveed
The refund of rs 2199
Amazon says that they had refunded the amount on the 3 jan and it will reflect back in your account within 3-5 business days but it's already 8 business days but i did not receive the amount and i also contact to the bank the inform me there is no transaction from the amzon the reference number that they have provided bme is (Refund reference number) for the transaction is 165256
So kindly help me out