[Resolved]  Sony Ericsson K790i — Replacement of handset, since it is continuously showing trouble, the handset in service centers since july 2009

I bought a Sony Ericsson phone on Jan,6 2009. After 6 months o[censored]sing this phone, the phone started to show various troubles. In the first week of July the keypad stopped working properly, so I deposited the phone at the service centre for repairs. The services provided by the service center were pathetic as they never picked up the calls. I had 2 travel 30km just to know the status of my repairs where a simple phone call would have done the job. So 20 days later I received my phone back with no apparent problems but with 15 days of receiving the phone the screen and the system connecter of the failed to work, my phone stopped charging and to make matters worst the screen became blank. I went the very next day to deposit the phone at another service center because of my previous bad experience with the first service center. Again I received my phone after 15 days with the in charge of the center personally telling me that I won’t face any problems with the phone. Within a week of this the phone screen started to flicker, so without any option I went back to the service center. Since the problem was not so intense the manager told me to return only when the problem becomes intense. I returned to the service center exactly 3 days after this date, when the problem became intense. Since then the phone is with the service center.
I have sent emails on the website seeking for a replacement but have received the mails for none. Even the letter I had sent to them last month has not fetched me any reply.
I am keen in getting a replacement for phone but sony ericsson is not even concerned about people who buy their mobile phones I have copies of all the job sheet that I have received from them.

I am enclosing the letter sent to them as well as the workorder sheet for reference.