[Resolved]  Samsung C700 Mobile — BATTERY DOESN'T LAST LONGER

I have purchased C700 Samsung Mobile with IMEI No: [protected] from Big C, Neredmet X Roads, Secunderabad vide their Bill No: 0153517 ( date not noted - it is not more than 3 months). From the beginning the set battery is to be charged twice daily. I donot generally use camera, music or even FM radio. I receive about 10 calls in a day and I too make say another 8 to 10 calls. The total usage will be not more than 20-25 minutes in a day.
I charge the battery from 6 am to 7-30 am. It won't last long. I charge again around 2-30 or 3 pm.
I used Nokia for more than five years. I never had this sort of complaint. When I contacted the showroom they too could not do anything.
Can something be done?