Sony India — Network issue in Xperia t2 ultra unsolved

Address:

Vadodara, Gujarat

I have submitted my cell phone three times in Sony service centre I have network problem in my Xperia t2 ultra I use only 1 sim and have problem while making call, I other person whom I have making call donot hear my voice neither I do I have gave my phone for repairing to service centre 3 times yet problem has not resolved I had asked for replacement but they are not responding neither solving my prblome what should I do I have gave my phone on 5th june 9th June than again on 12th june but am not getting any response