Amazon India — Refund not given for more than 3 months against cancelled orders

Placed following orders with Amazon.in on 17th October 2016. Paid Rs. 3309/- by Citibank Credit Card. After some time for some reason I cancelled the orders and received the cancellation confirmation from Amazon by mail. They also sent me emails that they have received the cancellation request and are initiating the refund procedure as the items were not even packed at vendor's end.
Order[protected]against which I received refund of Rs 190/-+Rs 999/- in my citibank credit card account.
Order[protected]--Refund of Rs 660/- Pending after 3 months.
Order[protected]-Refund of Rs 1250/-+Rs 210/- Pending -3 months
Out of Rs 3309/- I paid by Citicard refund of only Rs 1189/- is received so far. The balance amount of Rs. 2120/- is pending even after many emails and calls. The blamed the delay on Demonetisation step as Banks were very busy.
On 29 November 2016 Amazon emails me a transaction no[protected] by which they said the refund was made and asked me to give this transfer no to Citibank customer care.
No luck as when I contacted Citibank with this number the executive asked me to give ARN no for the refund transaction which is generated as soon as the transfer of fund is done. I am now asking amazon to give me this ARN no which they are not able to give. They simply are taking a stand that the refund was transferred thru this no and now I have to claim it with Citibank. The Bank customer care executive is insisting that they can not file a charge dispute unless they get ARN number for the refund transaction.
I am stuck now as dont know how to get my refund. Amazon rudely cut off the phone once on 11 Jan when I tried to call them again.