[Resolved]  Sony Ericsson W580i — Servicing

I have been using a sony ericsson W580i for about 1 year.It recently developed a speaker problem.I gave it for servicing at the sony ericsson service center at Kottayam, Kerala.They did repair the speakers at a nominal cost of Rs 350 however, they damaged the phone's display.They are telling me that the damaged display was not fault and refuse to accept there fault.I am sure there was no display problem before giving it to the service center.Now about 1/4 th of the display is completely black in colour.