Nokia 5800xpm
What to with this stone ba

I have bought this 5800xpm in the moth of November 09.since i have bought it, i am facing software problem with the device. The screen is not very responsive manier time i have to just fight with the phone to scroll or press a button.earlier i have used sony but never had any problem, now since i have bought this china made (you can see the mother board once you remove the battery like mobile costing 4k in market) nokia seeing other i m totally frustrated and feel i should have bought a china made 4k rs mobile which works better on software and hardware tooooo. Please suggest how can i get rid of this stone bar...

regards

sameer.