Apple India — Battery drains fast / unexpected showdown

Address: 400063

I, Madhu Pahilwani, Phone no. [protected], brought an IPhone 6S NB64GB, RGLD last year 2016. A Month ago few issues were shown by the phone. Battery drains out and also unexpected shut down are the problems.I have given this Iphone servise centre. they give me iphone without box. please give us new handset with the box.
It will be grateful to your if you replace the model by providing a new set with the box of course taking back the old one.

Madhu Pahilwani