See this standard vs advanced baloney has to go. Your costs are static (in terms of comparing the two). So one can only assume that the reason for there being two different playing fields and costings is a forecast one. Vodacom forecast OOB usage income. Which further highlights that you are trying to milk customers for going out of bundle. Unless you dont, in which case you would agree that doing all you can to prevent these is the only option. I believe this sort of penalty is ludicrous and predatory. Predatory in the sense that this income is made off non tech-savvy customers of yours who have no idea what all of this malarkey is about, but will have to pay when the day comes.
Then we have various methods of notification for OOB, which appear to be failing. Now you can either continue passing the blame on to your customers or you can accept some responsibility here to change things. See you use the 8ta one as an example, and I can see your argument being along the lines of wasting data having a download cancelled mid-way. This is easily resolved by having a notification pop up each time you open a new session, showing your balance and a warning to ensure that you have sufficient data for your browsing and downloading session. Simple solution to what you're trying to turn into a very complex problem. No need for 20 different types of notifications that sometimes work and are often delayed.
We then have contract data restrictions being set by default to ridiculously high amounts. Why? If you're aware of the problem, why are you not doing something about this? The few people who do use those large amounts of OOB data would surely prefer to be blocked and call Vodacom to be told their balance and how to better use data without being ripped a new one. The others who are okay with OOB bills of R10k+ are in the absolute minority. It really is a win-win for you to set your limit far lower and eliminate this shock-bill nonsense. Seems almost illogical to NOT do so, unless you're forecasting this revenue. In which case shame on you and your predatory tactics.
For the record, I am an equal basher for all consumer rights. It just appears that I fight Vodacom more often than not because you choose to engage with us, which is a great thing and thanks for that...