Moore's law
160MB per user may not sound like much, but considering that the average usage per BlackBerry user was only around 20MB two years ago it becomes significant.
How to mislead with statistics - 2 years ago is a long time in Web/Cell/IT.
Moore's law makes a big difference.
In 2 years, most BB users have upgraded their handsets to newer more media intensive devices.
The web has got bigger and richer in content.
BB Cameras have gone from 0 to 5MP & better, video is more common.
BB-OS7 is more demanding, BB-OS7 Updates are bigger, etc.
So, for a normal user to use 160MB/month is easy.
I think VodaCom is blaming the "down loaders" for the problem,
when the real issue is that 1.5Gb/s is not enough based on how technology has improved in 2 years.
If it's such a problem, just use the T&C's and disconnect them already.