Apple India — customer service

Address: 500032

01/04/2018. I order apple iphone 6 everything is ok and suddenly i got display problem and i took phone to service center and they have replaced with new phone and i have problem with battery life problem so i contacted to apple support in twitter they told me to contact to customer support and i contacted and customer executive told me take service center and they told it's an ios issue and i contacted to apple support and again they told to customer care and same thing repiting but they are not solving issue