Since my days of using ADSL I have always thought that we should be encouraged to use local bandwidth, not only AFTER reaching the cap, but BEFORE as well.
By NOT including local bandwidth in the count of our bandwidth usage, WBS and Telkom would be encouraging us to use local bandwidth from day one.
Everyone would benefit from this strategy as we would take longer to reach our cap when using more local bandwidth, WBS and Telkom would save on expensive international bandwidth and the local internet would get a boost.
To summarise: only international bandwidth should count towards our bandwidth usage and once the cap is reached only international bandwidth should be throttled.