Vodacom/Sony - faulty equipment?

I upgraded a contract at Vodacom Vanderbijlpark Vaal Mall branch. The phone was a Sony Experia Z3 - the so called water-proof phone. Except it isn't. Testing it we took a photo under four inches of water with ALL ports securely closed. One photo 0 and within minutes the phone fllickered and died. This was four days after getting the phone. I went to Vodacom - the technician could do nothing. It must go to their service department for testing etc. A week later I was told that there was liquid damage. Nothing can be done. Tough luck. We don't honour our 7 day replacement or consider that a waterproof phone should be that - waterproof. I took the phone to Sony i Boksburg (SSS Cellular) only to be told by them that there was water damage. Tough luck. Live with it. Am expensive phone that was a few days old does not work. Surely this is bad advertising from both companies? They have BAD ATTITUDE, BAD SERVICE, BAD AND MISLEADING ADVERTISING THAT SHOULD SEE THEM FORCED TO REMOVE THEIR 'WATERPROOF' PHONE ADS