Xperia Z3 - Not waterproof

According to many reviews and adverti*****ts, Sony led us to believe that the Xperia Z3 is waterproof (not water resistant).. That seems to be absolutely untrue. I used my phone underwater for less than 5 minutes, after making 100% sure that my ports are closed properly. I didn't go under water more that 10cm and afterwards I rinsed my phone in tap water - as said in one of the reviews. After a few hours my screen started dimming, then fine, then dimming again and I could see water in the camera.<br> I sent my phone in for repairs at MTN, because my phone is still under waranty, but today I found out that according to them, my ports were not closed properly and it is my fault. I am 100% sure that everything was closed properly! And additional damage is that I need to pay R330 to get my phone back.. Or I can have it repaired for R5000, but a new Xperia Z3 is R8000.<br> This is really unacceptable.. Such a big let down for such a wonderful phone!