I quite like iiNet and was worried this article was about them doing some dodgy advertising but...
"The ads correctly showed the $69.95 monthly price of the plan, along with the total price, but the ACCC says not enough prominence was given to the total cost."
So they were honest about the costs and they're being fined because some people are too dumb to do simple math? CostPerMonth*NumberOfMonthsInContract . It's two fucking numbers, multiplied.