Quikr — faulty mobile delivered by quikr and not responding to emails

I placed an order for a refurbished iPhone X for Rs. 39999, along with a Quikr warranty for Rs. 2400. I got it delivered 12 days later, with a faulty product.
The iPhone was supposed to be in "Excellent" condition which the website claimed was "as good as new", it was under the category "Quikr Assured" also.

But the product was downright faulty and it won't even turn on without plugging in to power.

The battery was fully broken: it has zero backup. When the charger is removed the phone turns off immediately, sometimes it turns off even when it is plugged when some application like camera is started. The battery is not storing any charge obviously.
Also, the volume/silent ringer button was broken and not functional.

I took it to an apple service center, they said the display is duplicate, the warranty I purchased will not cover the battery, and they can't do anything about the silent ringer button since it's connected to the phone motherboard.

Basically the phone I got from Quikr is as good as a brick, it is completely unusable, and it seems many parts are duplicate too. I got cheated for Rs. 42, 399.

The order was placed on Dec 27, 2019.
The faulty product was delivered on Jan 7, 2020.
Quikr order details:
Sub Order ID: 941992
Order ID: 10649459
Order type: Assured

I request for an immediate return and refund from Quikr. This phone is not at all usable and it was mentioned "Quikr Assured" and "Excellent condition".