Clio (V - 2000) 1.2 - stereo stole - now have electric fault?

My car had stereo stolen and they have doen no other damage. The wires where it was are all hanging out (some bare). The car was ok for a while minus dash lighting up and back windscreen working + no clock. Now the red immobiliser light is solid red on and engine DOES TICK OVER and try to start but wont fully start. Has electrical fault signal on dash. Central locking also not operating.

I guess it is a loose wire, blown fuse or broken cable from them yanking it out. How can i fix and is it big repair bill? HELP !!