Hi @isabelzhi, we have also received the same query on a separate thread and we have likewise replied to it.
You may check our response here: https://community.tpg.com.au/t5/NBN-Installation/When-does-the-billing-cycle-start/m-p/41199#M4598
It would be best for us to work on one thread to avoid redundancy and confusion.
We'll wait for your reply there.
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