I thought line rental was a fixed cost per month and Internet plans go by the amount of Data on each plan.
Your internet plan may have charges if you exceed your limits but again thats not done on a Time basis but by per Mbyte used.
The only 'Time' charge I know of is either making a call to a Mobile or STD/Overseas.
Go read the FINE print or failing that, take a Headache tablet and ring BigPond.
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