O2 'bill' - account shows no mention of a bill

[AM2205]

Hi all,

I moved abroad to Singapore at the beginning of this month.

About a week or so before moving, I transferred my number to an O2 PAYG SIM, as I just wanted to store my UK number on a basic SIM in the event I want to return to the UK.

I've today received an email saying I've got a bill of around £8 to pay. But when I head to the O2 website, I do not see any mention of any bill.

Could someone tell me what's going on here, and how I can just pay this amount off?

[MI5]

@AM2205 

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