I've spoken to them and got some meaningful silence on the other end of the line concerning this ;-)
Interesting thing though is that when one logs onto the Service Login Page - https://reg.mywireless.sentech.co.za/register/index.jsp (only availably from your My-Wireless modem) there is an option to purchase other accounts...
I see there's even one for Sentech CSR's ... maybe I should go answer calls at night ;-) ... wonder if they get 512K ? ...
One hopes that one day soon a larger package than 512K will be introduced and package prices shifted down to correspond. - I want 256K