O2

I just upgraded and paid the last payment for my current plan which the bill arrives on the 9th and is normally paid on the 23rd when will the o2 app update showing that I have paid it? And will my next bill arrive on the 9th of November now? So sorr...

If I was to upgrade today and pay off my last bill that is £28.99 that arrives on the 9th of oct but is paid on the 23rd of oct when would my next bill arrive? So confusing trying to find an answer. Any help would be appreciated.