Lava Mobiles — I am complaining about my lava phone

Address:

700003

I have purchased 2 lava x81 (Phone) on 3rd october and i got the delivery on 5th of this month.. After that i saw in one of my phone app lock is not walking so i called the flipcart bt they can con solve the problem after thay i visited to the lava service center to solv the problem but they told me this is the harware problem of the phone so i again call the flipcart and request to change the phone but they are saying it is not the problem of the phone.
Now you please tell me when my another lava x81 is walking properly and i am not faceing the problem with the same phone then why flipcart is saying it is not the problem of the phone.. When we are going to buy any thing there is a clause that if there is any defect then we can claim for replecement but now i god very bad response from flipcart.
When they are not able to keep their promise then they should not promise anything..
Such a harassment i ever faced.. Flipcart is saying to give my phone to service center for repair.
Why should i give my new (5 day old) phone to service center?? When there is a provision on flipcart to chang defect things..
I am not going to buy any other thing from flipcart.. And i will post this to the social media..