Apple India — problem in battery

Address: 122001

From last 5 day i m facing battery problem my phn charging seems to be 63 when i switch off and dan i switch on the phn i seems to watch charging 67 or 70 how charging automaticlly increasing. Mynphone warranty was upto 18 dec 2017 my face that problem on 15 dec i deposit on service centre on 16 dec on 20 dec when i reached to delivery my phone i seems to saw that the phone problem is same. Service centre is not ready to resolve my problem i have photos in which battery seems to be low in a second or in a minute yet i have not deliver my product