Asus India — Asus zenfone

Sir i residing in Mangalore. I purchased Asus zenfone in June 2016. after fifteen days i found that the mobile has a problem . the problem is that receiver of my voice call is not hearing my voice clearly. so i went to service center at Valencia in Mangalore. there they repaired so many times and lastly they told they have to change the processor . they told they changed it. then afterward there is no any complaint till one month back. but recently from one month some time i cant not receive the call, from yesterday my voice call receiver are not hearing my voice. then yesterday i went to the service center they cleaned the mobile and gave me . at that movement the mobile is alright. but after two three hours the same problem continued. please help me to be a satisfied customer . please give me replacement . because the problem arises with in a months of purchase . I have two sons. both have Asus zenfone
your loving customer
Mamatha R Rao