Amazon India — amazon is not taking back the product which I received twice.

Address:

Thiruvananthapuram, Kerala, 695043

I ordered vivo mobile and i got a mail from amazon that payment was not successful and asked me to pay again within 24 hrs otherwise order will be cancelled.. So i paid again but unfortunately payment remitted twice.
I ordered vivo phone and microsoft 640xl mobile cover but unfortunately i received two mobiles and two 640xl cover. One cover i returned as i have only received the item.

Wen they delivered he mobile, i was out of station and my parents received.

Now amazon is not willing to take back the additional mobile and returning my payment. I need help from the concerned authorities for permission to return the double delivered mobile and refund my payment.

As per amazon terms, we have to return the goods before 3rd november but they are now not responding.