Sony — Complain regarding water damage of mobile handset

Address:

Muzaffarpur, Bihar

I would like to say you that I have Sony Xperia Z1 mobile handset. I, mysel[censored]pdate it to lollipop os some days ago. Then after, my handset was getting warm and sometimes it was not working properly. So, I went to Sony service center in muzaffarpur. There, the Sony service centre told me to get updates my mobile phone there. But after considering the problem, the Sony service centre told me that my mobile phone was in state of water damage. And there I could not get my solution of my problem. Even, the Sony service centre did not take my further response of my problem saying being water damaged of my handset. So, I want to say that although the model Sony Xperia Z1 is completely water proof handset. Then, how can it get water damaged. So, please concern my above problem and give me the solution of it.