[Resolved]  Sony Ericsson W200i — service center engineer are not repare my cell phone

i perchaced a cell phone on 31-december-2008 with one year warrienty and at that time my phone is in big truble which is switched off automacaly after some time .And service center service provider are doing demand of money for repare my phone, which is in warranty.Solve my problem
service center address is as:-BULKA DAS BUILDING, BEGUM BRIDGE MEERUT=250001
MODEL NOMBER :-W200(I)IMEINO[protected]
PRODUCT NUMBER IS 002807CCMIL508W45