My phone will not even prompt anything, I can't even power it off without removing the battery.
I'll do a step by step as i've never done one here
1)Download the odin file I linked. Open it before you do anything else
2)Pull battery, remove sim card, and external sd card if you have one
2)Insert battery, press and hold both volume buttons(dont turn phone on)
3)Plug in the usb data cable into your phone while continuing to hold volume buttons, at this point your phone should turn on into "download mode"
4)At this point press start on the odin program, it will run for a few minutes and reboot, dont unplug till its completely done.
You should be back to stock at this point