Lenovo — Lenovo k6 power microphone problem

Address:

500013

Hello sir/madam this is likith kothamasi i have purchased lenovo k6 power in flipkart on april 10th 2017 i have used it for 2 months and now im facing microphone problem when i make a call the person who is on other end cannot hear what im saying so please kindly replace the product or refund the amount otherwise im going to complaint in consumer forum