2001 Pontiac sunfire

My husband stole my car and hotwired it and beat
the ignition switch to where he could start it with a
screwdriver. Now I didnt get a new switch yet but I
did get the little black box that is on the left side of
the wheel that connects to the egnition switch
cylinder and now my anti theft light keeps flashing
and when I start it, it shuts itself right back off and
it does that everytime that I start it. I was told that
it's probably stuck in theft mode what do I need to
do cuz I gotta get my car to where I can drive it
again