Union Bank Of India — Charge dispute union bank of India

Myself Priya, I have ordered and made payment(419 rs.) of the item from Amazon but due to some reason I cancelled it and after that i recieved a mail regarding initiation of refund but still more than one week the amount is not reflected in my ubi account. I have contacted amazon customer service and they send me a refund reference no.and told me that from thier side the refund was already initiated successfully, and they furthey said that I have to raise charge dispute form reagrding this so that they work upon it and amount get reflected in the account.