Why is he having a choice of dealing with it? It's his child. Teachers can become very irritating - and you shouldn't be the one fielding the calls. I am honestly afraid that you are in for a world of hurt and heartache with this man, and this child - and were you not pregnant, I'd advise you to run far and fast - but you're fairly tied now.
FWIW, we ground my daughter (step) from given things - i.e. All things that plug into the wall. Computer, Telephone, TV (it is only in the living room, no tv in bedroom here, and she gets 30 minutes to be in the living room because it has to be off if she's in there), her violin doesn't plug in, her books don't plug in, her art pad doesn't plug in, skateboard, and her Ipod (as long as it doesn't need recharging) - so those are all fair game.
Or she gets 'house arrest' whereby she can go no further than 200 feet from our front door. No friends houses, no community pool, no Nana, no going to the store (yes, someone has to stay home with her), no going further than 200 feet from our front door - unless she is going to the ER for her own personal injury. She hates house arrest, and we never use it for more than 48 hours.
Early bed time
Fines (from allowance)
It is what it is, and by not grounding her from everything at once we accomplish several things - we can make it hurt her freedom more and limit the effect on ours, we still have things to take away... and the world is not hopeless.