Locked Out Of My Lenovo IdeaTab Android Tablet?

I'm locked out of my Lenovo Android tablet, because my brother tried doing the pattern code many times & now it's asking me to sign in with my Google account & I did sign in with my right email & password & it still won't work. I even changed the password & it won't work. I tried doing a factory reset using the power button & holding the volume & still nothing. I logged in on my computer & it worked & on my Android, it won't? I need this to be fixed now. So what should I
do? Plus, whenever I try logging in to Gmail, there's no internet connection & I can't connect to the internet, because it won't let me. It won't let me do anything, until I put in my email & password in… So anyways, Please help, thanks!

Added (1). To Shayn: Yeah, that's what I said, but it won't like let me connect to the internet & I'm trying to click stuff & it won't let me, but it's being stupid, so I have no idea, but I need this to be fixed as soon as possible.

The tablet isn't connected to the internet so it's not syncing your new password up correctly.