Amazon.in - Cheated by the company

I purchased a laptop adaptor from Amazon.in on **/**/****. Invoice attached with one year warranty period. The Adaptor received from Amazon.in is defective and sent to service. I have received the defective Adaptor same without any service. I have paid Courier service charges Rs.**/- on **/*/**** through Professional couriers. Till today I have not yet received exchange/service/replacement from Amazon.in. Every time they asking me to send the details once again, but not yet received any positive result from Amazon.in till today. Already * months passed. Remaining warranty period is * months. They are reluctant to do any thing. Every time they are sending irrevelant messages like please be patience. How long it is they don't know. I have vexed with Amazon.in. I don't want to pay further single paisa to Amazon.in. I have lost Rs.*,**,***/- from my consultancy services due to their irresponsibility. I don't have any muscle power, money power, political power. Please help me in this matter at the earliest. Waiting for your early help.