Sangeetha Mobiles Private Limited — Not taken back or exchanged unsatisfied mobile phone

Sir/madam,
I have bought a mobile phone at the date of 19/01/2010 from sangeetha mobiles private limited, which is located in forum mall in bangalore. The mobile phone's company name is fly.
Description of goods is b430-fly-mobile phones [protected]. The price is rs, 3, 557.00 only
My complaint is i am not satisfy by using this mobile phone. Its complicate to operate. It does not have satisfactory sound quality, according to me.
So that, i want to return this phone. Because of this i have visited the same shop and i request them for taken back this unsatisfied mobile phone, and i told, in place of this mobile i want to buy another good mobile from ur shop only. And i was ready to pay theire survice charge and tax also. Even they are not ready to taken back or exchanged the unsatisfied mobile phone. It is happening within one day duration.
Is there any source or rights, about get back my money or exchanged the phone within a reasonable time and deduction of amount or full amount how much i paid for this unsatisfied mobile phone? Kindly help me by resolve my problem's of this unsatisfied mobile phone.. Thanks.