complaint

Hi upgraded my phone last year November, I tested the phone under water once, all ports were completely closed, I also had a cover on my phone. My phones touch sensors suddenly became unresponsive, I then took the phone back to MTN store at vna waterfront. I was given an email address to contact thomas from Sony -received no response. After almost 2 months, rebooting the phone all day, every day, and lots of cursing, it finally worked as nothing was wrong. After two days, last night, I wanted to update my software and the phone went off and now same problem!!! Touch sensors are completely unresponsive! !! This is ridiculous as they claim the phone is water resistant? ?? I am highly disappointed in Sony for not responding at all and I am paying off a phone contract of which I cannot use?!!!!