Nokia India — Lumia 720 phone is not working

Address:

Thiruvananthapuram, Kerala, 695603

I brought lumia 720 two years back. Last month i changed the software to 8.1. From there itsself i got a problem that it give some kind of buzz sound and goes to bing and come back to main screen and go to other screen.. This keep on goes. If i open any tabs it automatically goes off and returning to the main menu. Plz. Try to solve the problem or take back the phone and replace it. Otherwise case will be filled in consumer court there many people like this. By contacting them and together we are going to file case on you.
Name; nohammed shifan
Cell:[protected] email: [protected]@gmail.com..
Location: kerala, (India)
Imei number:[protected]

Regards,
Mohammed shifan