Asus — ASUS ZENFONE DISPLAY PROBLEM

Address: East Godavari, Andhra Pradesh

I am using zenfone5 (A501CG) having serial numbers SN:E7AZCY900863. which i bought in Sep 2014. Till y'day it was working fine, suddenly a dot was appeared on the screen and with in a hour it spread across the screen. Display was gone, we don't have any crack on the external screen. I am able to attend the calls, it seems that problem is with the display. I searched for ASUS service center which around 200KM (in Rajhamundry, Andhrapradesh, India) from my present living location. After lot of struggles i reached there but i didn't received proper response from them. and also i didnt got proper response form asus company for the mail i have sent. It is totally waste of my effort to travel long away to the company service center & mailing them several times so, i want to proceed legally . I trusted in ASUS and bought this mobile. What should i do now ?