Amazon India — refund of money for backpack bag

Address:

New Delhi, Delhi, 110059

I have purchased a backpack bag from Amazon which is blue colour i have booked on 21 august 2018 but i received orange colour in 23 august 2018. Then i talked to customer care executive she is agree for replacement for the same and i have received another same bag then i asked to customer care why you send me same bag again then executive replied sorry sir if you have received same product it means no colour available in seller so i refund your full money 527 rupees is your account but now today[protected] i have received only 487 rupees. So it is clearly indicate 40 rupees is not back. Now what to do?