Thanks. It it surprising how quick data is used.
You should write to O2 as you say
they should be able to tell you when you accessed it and how much each time
It may be that you browsed for longer than you thought
Or even checking emails takes up data
Web pages vary in data but can be from 100k - 1mb
So it really does vary and it could be low amount of pages but high content
If this does not resolve it you can go to the Ombudsman who offers a free, independent service
Can I clarify anything for you about this today please?
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