When you make a phone call from your residential phone you pay. When you don't call, you don't pay.
All you have to do is to pay a certain amount to own the line (13 Euros/month).
Well, if you don't mind, considering te amount of calls I make using the "mandatory" operator, I find this to be somehow excessive.
As for the mobile pack, it is always possible to take a mobile line without a pack (I am not speaking of the prepaid one). Remember, a few years back, that was the only way to have one.
I'm not taking side with mobile phones operators, (considering my job...), I'm just pointing out that what you call an arnaque is not an arnaque. Nobody forces you to buy a 8 hour pack, or even a 45 minutes pack, and just spend 10 minutes of it.