Anyone out there that knows how to block the ports on a ADSL Telkom router to prevent streaming. they listen radio over the internet and it's using all the bandwidth.
You will have to invest in a better ADSL router than the Telkom offering. Then you will have firewall options to block specific outgoing/incoming ports and services.
Another option is, assuming that you are running on capped ADSL, to let the idiots stream radio and on then on day 14 of a month be capped - so they can't do any work and raise the ire of your boss.
If you realy want to sh*t in your pants, install a packeteer between your Firewall / Switch and your router, and the see what is really using your bandwidth..