[Resolved]  Sony Ericsson K790i Mobile — Problem with handset and service centre

Hi,
I had purchased a Sony Ericsson K790I handset from TOTAL MALL, MADIVALA, BANGALORE on 03rd May 2008. From day one it started giving me problems. The screen will turn to a blank white screen some times if I speak on the phone for more than 10 mts. It happened 7 times in one month time.So I went to the authorised sony ericsson service centre located in HSR LAYOUT, BANGALORE. They said it may be a software problem and asked me to wait for 1 hr to get the software reinstalled. After 1 hr they said, it may be a problem with the motherboard and they would require 4 days to get it repaired or replaced. So, I have decided to surrender the phone only after 1st of July 08 as I will be out of station for some days.
But, when I returned home from the service centre, I realized that the VOLUME INCREASE button is not working and the panel inside the phone which holds the battery is broken. I found the broken part inside the phone. So I rushed to their service centre again. However, they were not ready to accept that it was their fault.
I went there with some software problem and returned home with two new issues. I am very much disappointed about the way handsets are handled in this service centre. Now I don't know if I will get a replacement for the phone.I am scared to give the phone to the service centre people.
Please help me to get SONY ERICSSON international contact mail ID. So that I can register my complain about the phone as well as the service centre.
Thanks
Jineesh