Many shops charge 1 hour just to look at the car for diagnosis. Then if the serp belt goes around the engine mount, That could cost another hour, and then if the belt is expensive and a tensioner, you may not have gotten as ripped as it seems, but it does sound high.
What is happening is the security code from the ignition switch is not what the pcm expected, so it puts the car into security lock-out. Several things can cause this, but replacing the ignition switch and relearning the security code is the probable fix. It's a headache, so I would take it to...