The solution to this is to put these people in prison. Phone harassment (and telemarketing is harrasement) is theft of attention and that ought to be as illegal as any other kind of theft.
This kind of thing should be settled in civil court - as it is.
violence: an unjust or unwarranted exertion of force or power, as against rights or laws
I would say some would label stealing a car as a violent action. But of course different people's definition will vary.