NO FEEDBACK AND FALSE ADVERTISING

My son's brand new SONY XPERIA Z3 stopped working after 5 days. Autopage sent it to their repair centre, but 3 weeks later it came back with a message that it could not be repaired due to water damage. My son did NOT leave any ports open, but was outside in the rain with his phone. This phone is advertised by Sony (on TV) and by Autopage in their glossy brochures as WATER PROOF NOT WATER RESISTANT. Autopage have sent the phone to their Gateway branch, to the Sony agent. I am unhappy that they have not replaced the phone, nor given me any feedback for over 3 weeks. Not once has any phone call been returned as promised, despite my numerous phone calls and visits to their shop. I have paid for a service for 2 months, and had a working phone for 5 days only. I feel that the phone should be replaced without further delay. One unhappy customer!