You will pay upto the point that you use your PAC. The sooner you use it, the less you'll pay, but remember you will still have your O2 balance to use up which you've already paid for so time your transfer to coincide with the end of the bill period to get the most from your O2 bill.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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