Apple India — 12 inch macbook display

Address:	Bangalore, Karnataka, 560039
Website:	Imagine

My 3months old 12inch macbook got a hairline crack in internal display and there are no signs of any drop or anything. There is not even a single scratch on my macbook. This was a hairline crack and happened on it its own. Many people got this problems with macbook and got it replaced but here in bangalore, service centre refused to replace it. They asked to pay 50, 000 for screen
Why should customer pay if this isnt his fault?
People at apple service centre and ssles person said that they know that its not done by me but they cant help