Nokia India — Lumia 720 Mic Not working

Address:

Chennai, Tamil Nadu

Recently I got the display changed as that had shattered(touch n display were working fine though). Now the new problem is Mic is not functioning . People are not able to hear me and also I am not able to record. Was wondering if it could be a software driver issue so tried installing the latest phone updates. But still the problem persists. Could it be because of new display that has been fixed? Can someone help here please.