Lenovo — My mobile LENEVO A536 having dark black spot(Screen not functioning properly)

Address:

Panchmahal, Gujarat

I purchase lenevo A536 Mobile on 11 Sep 2014 invoice no 963 from Jay matadi Comm.The screen of mobile is not functioning properly.Due to high atmospheric humidity the moisture entered in side the screen .due to which the most part of the screen is invisible & I am unable to watch the contact list, Message, Mails, Video &movies.The phone becomes overheated, Processor malfuctioning, hang, Auto call dial, Low battery backup etc problem is all present in phone. When i contacted the nearest lenevo service center KABRA SALES, GODHRA, GUJARAT he told that the screen doesnot comes under warranty.When I asked to give the same thing in writing or acknowledgement for my complaint he denied to give the same. It is manufacturing defect the phone screen must survive in any atmospheric condition or must be the moisture proof & the screen is not physically damaged & visually in very good condition.Apart from it in warranty card it is mentioned that warranty for product one year & for battery 6 month.The screen is a part of the product.So please help me & give replacement of the phone.