Sony Aqua - disappointment

My son bought a Sony Aqua after losing his phone in a smash and grab. On day 3 of him receiving his phone he took a picture under water (Swimming pool step). The next day it showed water damage. On Monday Vodacom Cresta sent me to Vodaworld and Vodaworld sent me to Sony Boksburg for a pressure test. I dropped it of and they said they will courier it back to me and will be in contact with me on that Wednesday. Not holding my breath i call them on Friday only to be told that the test showed water damage (Only they will know) and that it was my sons fault as he did not check that his ports were closed. My son is addamant that he checked that his ports were closed. It is a brand new phone and now according to customer care there is unfortunately nothing they can do as it was my sons fault....How on earth is this possible when they advertise all that the Aqua can do.....It is false advertising....i have been pushed from pillar to post and all i get advised of is sorry but there is nothing we can do...When entering another VOdacom branch earlier today i was shown by one of the employee, 3 people with the same problem and not to tell customers....PLEASE HELP