@Klean
The outstanding amount won't update until your bill is produced.
The ideal way of doing it is to pay as you go through the upgrade process, rather than in advance.
Looks like you should contact the sales team as they can help with that – message them on Social Media if that works best for you -on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG)
Or you can call them on 0800 081 0255
Thanks
Guide: Upgrading Your O2 Phone
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