PAYING TO FIX A FAULTY PHONE!!!

Late Last year I had a problem with my phone(Sony Experia Z3) where the screen was lose on the top and the speaker was not working, and the battery would over heat. So I booked it in and was told that I damaged the phone and needed to fork out R2500 to have it fixed which I did begrudgingly as I hadn't ever dropped the phone nor damaged it anyway. <br> <br> This year, the exact same problem has resurfaced and I am again being asked to PAY R2800 to fix the phone!!!! The phone is not older than 2 years and falls under warranty but I am being asked to pay to have a phone that was faulty to begin with and recently fixed,fixed AGAIN!!! NONSENSE!!!! I DEMAND MY PHONE TO BE FIXED AS IT IS UNDER WARRANTY AND I NEVER AT ANY POINTS DROPPED IT OR DAMAGED IT!!! EXACTLY WHAT DOES THE WARRANTY COVER AS THE PHONES SCREEN KEEPS COMING OFF?????<br> <br> Further to this, when I took my phone in I was not even given a temporary phone whilst the faulty one is being fixed! I am prepared to take this to the Ombudsman as clearly Vodacom/Sony are shying away from their responsibility.