Intex Mobile/ Big C Mobile Stores — Intext 4G+

Hell, I am Henry Thomas from Hyderabad. I bought intex 4G plus mobile phone on[protected] from BIG C. I gave it to my wife and went to out station . But from the starting the phone is not working properly. when we are trying to speak noise is coming. I am very disappointed with this mobile. when we call to customer care they are simply asking us to give it for service center. please suggest me How can Get replacement for this mobile.? Thanks in advance