Nokia 5800 — loose body, loose screen

Address:

Nagpur, Maharashtra

sir,
I bought a nokia 5800 on may 2nd 2010. Since then im facing the problem of loose fit of it. I visited nokia care many times, but no solution. Submitted it thrice at nokia care to be sent to nokia delhi with a hope of replacement. They fixed it but with some new problem everytime. And now the screws are also worn out due to frequent screwing and unscrewing done by nokia people. Now the major problem is that the screen is loose at one end. Since it is a touch screen phone,it is not at all acceptable. When i touch the loose spot(screen area near the green button), it goes in about half a centimeter.My phone is the worst amongst the lot of 5800. I want it replaced. Please help