Samsung — Mobile Hardware & Network Issue

Address:

Pune, Maharashtra

Hi, I Bought Samsumg Grand Quattro on 12th September 2014. It was working for properly days but that I was facing network problem, so i use to switched it ON/OFF then it was working properly. But I was facing same problem every after an hour, I went to Service center which is located at swargate pune, they took my complaint. When they check my moblie they said me its mother board problem so they change mother board. But still i was facing same problem, so i did change my SIM but I was facing same problem. I did went to service center again they said me not install application. I bought smart phone to use all application & for calling and these service center people say not use application. I ask them for replacement but they are not ready to do so. Now my mobile is with service center under observation. I am frustrated with samsung service, please help