Amazon India — amazon is selling defective and fake product

I bought samsung c9 pro(oreder no-
[protected]on 29 Aug from Amazon worth of Rs. 31999. But they delivered defective piece which causing heating problem. So I again place order for replacement order no[protected] which I got very late after one week since I placed the order. But this time they did not delivered defective piece but dead phone. Since 11 the September I am calling each and every day but no one is coming to pick the phone for return. Amazon customer care are very rude and they simply convince me next day your phone will be picked up and assure for refund but on next day no one come. I am stil waiting for someone who come and pick up my phone so that refund procedure would be initiated as soon as possible other wise I may have to pay interest at around 500 to bank for buying nothing.

Can some one suggest what should I do for refund before credit card bill generation date which 22th September or If i may need to pay extra interest money to bank then in that case what legal action can be taken to get extra interest money from Amazin.