Philips India — philips in-she1525bk/94 headset with mic not working

I bought the above mentioned product from flipkart
It was bought on 5th dec 2017
I find the right side of the earphones and the mike for answering calls not working.
The flipkart team gave me a number and i have tried calling the customer care and i waited for 15 min but no response
When i called the city office they told they dont do headsets
It is under warranty and i want to know what can be done to fix this
I bought this for 519 inr only in dec and its april 2018 i am facing this issues