She didn't know the "market value of the service." She knew the market value of consumer 3G, assuredly, but I wouldn't expect anyone who wasn't a telecom contract negotiator to know what power companies would be paying. Thus, your last sentence is meaningless: I suspect that she would indeed have found this "too high" if she had known, but rather would have been willing to pay a consumer-rated fine.
Say I steal a car. This car has a child in the back seat, but I am not aware of that. In fact, I go on being unaware of this for the whole time I am in possession of the car (and the child is fine, somehow.) When I am caught, do I receive the punishment for kidnapping, or simply for grand theft auto?
In the U.S.? Kidnapping, almost assuredly. Probably depends on the prosecutor. As it should - you kidnapped a kid. Doesn't matter if you knew he was in the backseat; you did it.
Say I steal a car. This car has a child in the back seat, but I am not aware of that. In fact, I go on being unaware of this for the whole time I am in possession of the car (and the child is fine, somehow.) When I am caught, do I receive the punishment for kidnapping, or simply for grand theft auto?