Not sure what the misunderstanding is - there is an Act of parliament and amendment Acts to that, that empower scamral - it's the Law. How invoicing and fees due is recovered is purely administrative and won't be written into the Act.
From what little I read just now, the Act makes no distinction between a physical and an electronic toll. When you use a toll road with a physical toll booth you don't sign any T&C's - you liable nonetheless.
You are right and I think the majority of people had been shocked so tremendously by the announcement of toll roads that they totally miss this.
Toll related law has been established years and years ago. You cannot use a toll road without paying, and the law never distinguished between any different type of toll roads.
Government just shafted everyone in the A@@ when they erected the toll roads with the aim to continue their corrupt practices and satisfy their endless need for greed.
Unfortunately, everyone will just end up paying - no matter all the lies or laws and as with Taxes government will ensure that everyone pay their toll fees due.
As with taxes, I have been present over years where people received fines for not paying taxes, to a point where they were sent to jail for one or two years. If you do not declare tax today the minimum sentence for a first offender is 10 years in prison. I see the gauteng toll road issue will also turn to this.