Lenovo — Defective audio system of Lenovo k3 note mobile . Caller can't hear me.

Address:

New Delhi, Delhi

I purchased a Lenovo k3 note mobile on 22nd July 2015 through online sale by Flipcart. But within a week it developed audio problem and callers can't hear me out. I have to shout at the microphone of the Lenovo mob to make them hear, that too not audiable clearly, and voice seems to be coming from very very far away in a very low pitch. I am so perturbed and unable to make a call from this mobile.