@Gharper
It could be your device plan plus your airtime, it could be overage that you have spent, you can check in myo2 either on this website or via the app.
If you need any help then call the payment management team on 0800 902 0217
This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company
