That's a strange one for sure @carbonsa , data usage is automatically capped and without first purchasing additional data it would be impossible to go over the allowance and incur additional charges.
At the moment you are looking at unbilled charges and these may be recalculated when the bill is generated. You can speak to Vodafone but they may well ask to to wait until the bill is ready to be viewed online this will give the Team something to go on. Most certainly, if this happens again, don't hesitate to contact Vodafone.
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