Amazon India — refund not done after 26 day

Address: New Delhi, Delhi

i have purchase dell laptop on 25 april 2015, they take deliver the laptop on 1may 2015. i have check and find the they send me the less configration laptop. customer support saying you can return product and you will get the refund 3-5 busi days. 3 of may the pickup the product. and still i am not getting refund amount. they are saying they have refund to bank contact bank we have release your money. but i ask so many time to bank and they saying amazon didnot refund the amount. Order#[protected] please any one suggest me what to do .