Default Difficulties with towelroot...

Hi,
I'm completely new to the root world...
I tried to install towelroot V2 on my Galaxy Note 3 which runs the Kernel 3.4.0-636608.
I rooted it, root checker said all ok, but after installing SuperSU, updating binaries and rebooting the device, root checker says it's not rooted...
Now it's worst, Wifi is turning 100% even when turned off, and sometimes the screen of my phone stays black, even if I push the buttons, in that case I need to remove the battery and to reboot the phone...
Any solution ?
Again I'm a newbie, I don't even know how to restore the phone or to do a reset, so please help me...
Thanks in advance