Apple India — about iphone

Address: Bhopal, Madhya Pradesh, 462023

I have trouble for many days of this iphone 6 the iphone has a problems of hanging, battery backup, networl problem, call dropping since when i am purchased and 3 time i was visit a apple care but no resolution have given me so, i want to replace the iphone this is a very worst experience of iphone. So, please resolve my problem as soon as possible