Double sized bills should only happen when you take out a new contract. The contracted fee is always paid for the month ahead and any charges racked up during the past month go on top of that.
If you get a new contract your first bill will include the contract fee for the month ahead plus the overhang from the previous month, which is the contract fee for month 1. When you leave the contract they repay any overpaid amount.
Throw partial months into the mix and things can get confusing. Telstra bills can be a puzzle, but as often as I called them to complain it always turned out that the bill was correct and that I didn't understand it.
Cheers
Steffen.
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