I suppose the only thing you can do now is move out, since they most likely won't stop getting in your way for as long as you live there with 'em :(

Question is are you paying rent? If so tell them to fuck off and get a lock for your room, both door and window. If they continue smash the tv the next time, but give them a warning of what you'll do beforehand. Harsh? Yes, but they'll get you mean business.