Failure to comply with warranty / Bad service

My Xperia Z3 is faulty the screen started to protrude out the device. No physical damage was done to the screen so the was something obviously faulty with the device. Besides this the device works perfectly I decided to send it into Vodacare who booked it in under warranty. Some time later I was informed that the device was BER when I tried to ask if I could therefore receive a new device I was told I would be called back by Vodacare as I assumed I never received a phone call the next day I went to the Vodacare store to speak to the people there where I was told because of the liquid indicator my phone is not underwarranty which is odd because the phone is advertised as water resistant and I had not exposed it to any liquids after much arguing and being told to phone a different Vodacare while I was in Vodacare I rebooked in my phone and made a repairs escalation after a while(more then the 7 day allowance) I was informed that my phone was suddenly repairable for over R4000 the new reason why I had no warranty was due to physical damage even though there is no physical damage the person assigned to my escalations now refuses to reply to any of my emails as I would like to escalate.