SONY XPERIA Z5 THE WORST!!!

<p>I've got a sony Xperia Z5 and I've lost the store slip and the store i bought it from is 100s of kms away,but i still have about 8 months' warranty on my phone which is a good thing coz it bugged out on me a couple of months back, i answered the call whilst i was showering and water somehow got in, Yes all the ports were closed and now my phone doesn't want to switch on, this only happened though after the software upgrade i had a friend that booked it in @ Vodacom as he done me a favour because he worked for a Vodacom store but they returned it days later without fixing the phone up saying its beyond economical repair, I received the phone back in a worst condition and now I'm clueless as to what to do, I paid 14k for this phone and now I'm using a blackberry that doesn't even have WhatsApp,</p> <p>please advise as i would like to take legal action against sony for falsifying their adverti*****ts and for grievances caused as well as time wasted</p>