Nokia 5233
Terribly slow/Low sound/hanging

I bought a nokia 5233 from nokia priority Thiruvananthapuram, I bought this phone especially for hearing music, the nokia's TV ad about this phone is that it is good for music playback. But when i compare to my friend's low end phones, they have awesome sound than my phone's. This phone works with a motion sensor, it automatically rotates screen according to the phone's position, most of the application hangs or crashes when i rotate it, the camera will goes ir-responsive.

I payed Rs7500/- for this dump, Any way to get my money back or get a new phone set?