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You, and I, should stay on speed pack 4. Their Speed pack 3+ states:
*Speed Pack 4 until 31 July 2020: Until 31 July 2020, customers who purchase Speed Pack 3+ will initially be on Speed Pack 4 and may experience higher upload speeds. From 1 Aug 2020, customers will be on Speed Pack 3+. Customers can stay on Speed Pack 4 by contacting us, in which case, they will be charged $30/mth from 1 Aug 2020. For more info about nbn speeds, please go to:
So if 3+ have the option to go to 4, then those already on 4 should remain there.