If it was a snake, it'd jump off the screen and bite your face off. See that line there that says 2.0GB Warning? That's movable and that's what's causing you to get that notification. You've gone over your warning. I think there's a way to remove it altogether, but I don't recall right now. I know you can also set the LIMIT when it will actually shut data off for you, but that's the toggle that you have turned off.