iPhone 7 Not Charging or Turning on

Messages
81
Location
NA
ISP
Airtel Broadband
I have purchased iPhone 7 at the same time it was launched but today's morning when I plugged in my phone it just showed charging symbol once then it disappeared and it never charged again and now its switched off and showing no signs of charging or turning on I have tried 3 different chargers but none of them helps........Please tell me what can I do?

Thanks
 

Top