I don't think you are helping make the case that IPC is to expensive with the figures you've presented
go to page 22 and you'll see a figure of under 2k a month per megabit
https://www.icasa.org.za/Legislatio.../ItemDetails/mid/1685/ItemID/933/Default.aspx
Since 2011 IPC costs have almost halved.
An that there , your last paragraph , is the essence of the issue. So they halved the costs in 2 years time and still make a nice little profit. You`ve been milked dry ( indirectly via your ISP ) for an ADSL service prior to that. Any they only agreed to start decreasing the costs because Wireless started killing the fixed line business ( and off course the Comp com slap ). If it wasn`t for that you still would have paid charged accordingly via your ISP.