Asus — Monitor broken

Address: Ernakulam, Kerala

I purchased one ASUS zenfone 5 on Feb 9 2015, unfortunately, its glass monitor broken automatically yesterday afternoon, The Mobile was on my table and i heard a sound from the set, when i looked on the hand set its glass monitor is breaking slowly in front of my eyes, I went to ASUS service center Kadavanthra Cochin Kerala, immediately, and they are not believing me they told it wont happen if the set didn't fell down. and asked me to change the set/ pay Rs 4500/- for changing the monitor. i am too much depressed, because the set was just 2.5 months old, i am so sad. Kindly help/Advice me regarding this issue ASAP. I can make and receive calls, can use Internet rest everything is okay, but the glass got damaged.