Amazon India — order cancelled but 60% payment received.

I ordered a microsoft office student 2019 on[protected] & made payment 5149.00 by credit card. I want to cancel it after 1 hour as there was many negative review about the product. But there was no cancel option. I contacted amazon customer care & they assured me by phone & mail that they will cancel it & will refund my full money. At the same time the seller (Name: 360 media, third party seller of amazon) said that this is not physical item, some difficult issues & they will take charge but amazon sent the seller a mail where they said not to take charge for cancellation of the order. To see that i again sent a mail to amazon & they said they will refund my full money within 2 days.
But today on[protected], a message sent by amazon to me that they are going to refund only rs 3068.00.
The item has not delivered to me & i think the packaging cost may not be rs 2081.00.
Please help me to get back my money.