Data charges when mobile data was off

TripleChocolate

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Oct 17, 2016
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Hello, i've read some threads about discrepances in amount of data cellphones report and data mobile operators, and i can understand there can be difference because of packets bla bla... however my mobile data was off for 10 days, i was even in airplane mode, yet in listing it shows i have used internet many times and each time it is same amount 0,10MB... my phone data usage shows 0.00B and that no aplication used data during that time.
How is this possible?