I think this is a sign of things to come.
My old high school used to operate off a dial up 56k modem, which obviously became totally useless as the school and the computers grew. Unfortunately, adsl wasn't around back then, and isdn was useless.
A couple of years ago they finally changed to something else, and they went the iBurst route. I had advised them not to, adsl was cheaper and more efficient, not to mention reliable, but some hotshot on the governing body who "knew computers" over ruled everybody.
From what I was told recently, when their contract ends next year, they are going to switch to something ele. iBurst top ups cost way too much, and they are going through cap like mad every month. Maybe by the time next year, they'll be able to get something from Neotel at a flat rate.
At my work place, we also have too high a bill every month. Worst is that as a private school we can't apply for Telkom's e-rate thing, that is only for government schools.
Just got to keep hoping.