Today I opened my mailbox in my new Samsung galaxy J7 and this screen appeared:

**WARNING Your samsunh galaxy j7's browser is still infected with a serious virus! Continue with instructions to fix phone. Do not close this window.Exit at your own risk.

When i pressed OK, it took me to UPDATE BROWSER, and on pressing 'back' the phone started vibrating crazily! As the alert was from GOOGLE, i decided to go with it and pressed 'UPDATE BROWSER', it took me to a new page sitex.dmtracker001.com, but luckily error 400 appeared and it didn't connect.

The warning and vibration didn't go away until I restarted the phone, but it appeared again after sometime and nothing I do makes it go away.

I dont know what to do, please help me.