Xiaomi India — battery backup is not good at all

Address:	Vizianagaram, Andhra Pradesh, 535183
Website:	Google

I had buyed a mobile on 2july and these mobile battery backup is not at good so went to services centre they did software update but there is no use... and again I went to the service centre and they something but there is no use soo I want to exchange my phone... Pls do it as well as possible and iam soo excited to buy these mobile if the mi mobiles are like these how we can buy that mobiles