Reserve Bank Of India [RBI] — transaction has not been credited by the bank

I, pratul khanna, central bank of india a/c [protected] (Nayaganj kanpur) and my rupay debit card no.[protected]. I have purchased a product from amazon and made the payment from my debit card and on returning the product they pushed back rs.603.10 in favour of me but i haven’t received it yet in my bank account dated[protected]. The authorization code (Refund reference number) for the transaction is[protected] given by amazon team for tracking funds. Till now money is not credited to my account don’t know where it has been stuck. On complaining to branch they asked me to mail but nothing happened till now it’s been 12 days