State Bank Of India [SBI] — skinny fit jeans refund

I am customer of sbi. my account branch is in kariyavattom technopark.
On 21st january i have returned one product in amazon.
After that i will get one message that your refund money was initiated. And they intimated me your refund money will be in your account before 27th january. But i did not get my refund money till now. Then i called to amazon customer care number. Then they told me that we have already refunded your money.contact your branch and ask for refund. They gave the reference number of that transaction.