[Resolved]  Sony Ericsson W350i — lot of problems with this phone

i bought a sony ericsson w350i mobile phone on 10/05/2009.after a month the flap of the phone broke and came out.i have one more phone so i used this cell phone only to listen to songs and play games.this cell phone was not used much.as far as i remember the phone never fell from my hand.suddenly one day the flap broke and came out.after that the over head lock system stopped working.soon my music player stopped working,not even from inside the menu.gradually the phone colour started fading and the light behind the number pad stopped working.please help me out with this problem.it has been four months and i am still not able to use it.'one mobile' the mobile shop from where i purchased this phone took no responsibility...please help me.