It is indeed possible that the out-of-bundle usage we show (per SIM card) on our website and in the Viking App, is not 100% accurate. Sometimes the usage on your invoice will be lower than the usage in the Viking App.
Are you seeing any out-of-bundle costs in the Viking App you’ve already paid? They’ll be reset at the end of the month, and won’t be charged twice. There is a technical issue right now that’s causing this.
The notifications about your out-of-bundle usage you receive by SMS, are sent with a max delay of 30 minutes. To get an accurate understanding, you therefore best use the SMS messages.