Jannie, with all due respect, you guys Ef'd this one up royally, and the blame lies squarely on your own (Vodacom's) shoulders. My biggest gripe is that a lot of the things you said over the last 2 days on these forums contradicts what Pieter Uys said today. As an outsider, it looks to me like he's calling you a liar. This is extremely bad PR, worse than even setting the limit at 100mb. Don't you guys discuss these things? Did you not try to contact Mr Uys after the schitt hit the fan, to discuss a plan going forward, instead of doing your own thing (defending 100mb), only to then have Mr. Uys go and say the complete opposite (there will be no throttling whatsoever).
The above issue aside, what guys SHOULD have done, is to quietly set the limit to 3-5GB, after which the service would be throttled down to slower speeds, or better still, cut off. You should have done his without telling anyone, not even your PR division, and then monitor what it is going on. See if it makes a difference to performance. Those being abusive, would get slowed down drastically, or cut off, and they would contact Vodacom to complain about their BIS service not working anymore. You could then decide how to deal with these guys, diplomatically, quietly, out of the public eye.
And in the meantime, you continue working with RIM to implement a solution that will help you to easily identify the abusers in order to nail them solidly.
By doing so, not only you would NOT piss off your 98% of users who use the service as intended, but you would also get the abusive ones to report in by themselves.
Even if you didn't cut these abusive guys off, a few threatening/warning emails or telephone calls (without any actualy threats being carried out) would have caused them to change their behaviour very quickly. Tell them that what they are doing is in contravention of the terms of service, and that they will be billed at standard data rates should the abuse continue. Imagine 300GB x R2000. Hell imagine, 10GB x R2000 (R2 per MB = R2000 per GB).
You guys need a Lesson 101 in PR, quiet diplomacy, and how to not piss you subscribers off.