[Resolved]  Sony Ericsson — phone not repaired properly

i gave my phone to the sony erisccon certified service station at 105, paradise, behind park plaza, sarojani marg, c-scheme. My phone gets switch off automatically.Whenever i use to listen to songs on it it use to turn off automically.I gave my phone for servicing they told me that it's motherboard needs to be replaired. I gave my phone on servicing on 23th of september since then i have given my phone for servicing two times and i m still facing the same problem.They are not responding properly and are not telling me the problem my phone is having and not even reparing it properly. Such a service was not expected from sony ericsson. my model no is w7601 and my present job sheet no is SES08JPR20627.(which is the fourth job sheet).