GoOD DAY

I got a Samsung C6625 in October 2010. I had to send it in for repairs for the 3rd time now. I've been without a phone for 2weeks now. The phone looses signal , the battery don't last for 12 hours, My phone sometime's has full signal yet no call come through. Sms'se sometime take's up to 6 hours to come through. What should I do now. Im really sick of having trouble, What should I do