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Please not the Bill Cycle date (The bill amount is issued & your free units are credited) is the 17th of every month.
Your plan was activated on July 4th & therefore, both the free minutes & the first monthly charge are prorated - meaning you get the minutes for the period from 04/07 - 16/07 & you'll be charged on your first bill for this period only (Your data was given in full)
Starting form 17/07/2017, you'll get the full minutes & you'll be charged the full monthly amount