Remove Phh's superuser? I have TCL Alcatel Pixi 4 (5) 5010D phone that i bought and decided to root it. I was kinda new to this kind of rooting (a bit complex) because i used kingroot before and it worked just fine till i got this phone and no app for rooting helped me which lead me to rooting using my computer.

I've searched on google and found one thread on XDA by kirito9, showing his tutorial on rooting Alcatel pixi phones and i've found mine there. Multiple choices occured and i couldn't decide which one is easier for me. So i went on to try phh's superuser method. Everything went fine, i've got TWRP installed on my phone and flashed phh's superuser onto my phone, rebooted and... well it booted fine. Installed the required superuser and Titanium Backup. Superuser worked fine and so did Titanium Backup.

Later i decided to uninstall some system apps that i didn't need and were wasting space so i downloaded system app remover and allowed root access.. as soon as i tried to uninstall the app, my device rebooted. I thought that was a normal process but i saw that the app did not uninstall. Tried again, same thing. After doing some research, found out that i don't have access to rewriting /system and files in it at all. I tried downloading an app again to make /system rewritable, but no access. Then tried it through ADB but didn't work as well.

So not sure but i think that's half root which i don't want, i wanted full root but i didn't get it. Now i wish to remove this phh's superuser and trying to get root another way if i can without bricking my device and of course, making /system rewritable so i can uninstall useless apps. Can't even install busybox because of this. Would appreciate help on both uninstalling phh's superuser and getting another method of safely rooting my phone.
You should try this using es file explorer. 
In the dash board of es file explorer, go to tools then turn on  the switch for root explorer. After that consider turning recycle bin on for later restores. Next tap on root explorer and a subwindow should open . Select Mount R/W. That's rewrite permission. Still there, you can select uninstall system apps. It should work well. Proceed with caution and at your own risk