PAYG Data usage popup notification issue

[Anonymous]

Once a day my new Xperia phone is displaying a popup notification telling me I've used mobile data and won't be changed more than £1 for the remainder of the day. This happens even though I've always got the mobile data setting switched off - I only use Wi-Fi. When I check my PAYG balance, it's not going down.

As long as I'm not being charged for NOT using data, it's just an annoyance really. Just wondering if there's a way to fix things from my end. I never had this issue on my previous Xperia phone using the same SIM card.

Thanks.

[MI5]

If you call 4445 you can ask CS to turn the notifications off or try live chat as they can probably do it too.
http://www.o2.co.uk/contactus