Apple India — Battery problem

Address: 132103

Website: www.apple.com/in

Hi, i have iphone 6 64 GB in golden color, my iphone suffering from battery issue from last 6 months and it's not working proper, even i had also submitted 3 times to the service centre but they returned me the same with same wordings that your iphone battery is ok. Kindly sort the matter as soon as possible and take it serious & also note down my case[protected]