Samsung Digi Rap — New phone so many troubles

Address:

West Bengal

This is a complint regarding Samsung Digi Rap phone which I had purchased on the 18th of February, 2011 with a
Bill Innovice number I2010-11/[protected]
Model no. SCH-B379
FCC ID: A3LSCHB379
This CDMA phone at first within 5 days or so was gviving problems in the MIC, which was ultimately replaced in about 15 days at a samsung service centre. Since then it has never been well. Now whenever I am inserting a sim in the phone the network is not coming and the phone is hanging on without any activities. Sir, you just say is it possible to give the so new phone again and again to a service centre.
I hope you will make provisions for a replacement of this phone or else I will have to take major steps in this repect.

Hope I will get a response soon.