Sony — Screen of Xperia Z got teared and company is refusing to replace the piece

Address:

Bhavnagar, Gujarat

I have purchased Sony Xperia Z from company showroom with proper bill. No one has come from company to explain any function/ demonstration of the phone. Sony company says the phone is water proof and scratch proof. I kept my phone in my pocket and suddenly when I saw it has got hair tear on the screen. The glass is teared from the side which is not even visible. The sides of phone are yet finished, it is proof that phone doesn't fall down or not hammered. It seems it is a company fault and still service centre of Bhavnagar denies to replace the phone.. They asked me to deposit 50% of phone cost which is 17500/- . How one can pay this much for the phone under warranty... My complaint number is w[protected].. The service person of Bhavnagar is not responding well and not listening me properly