I think the same thing was happening to my partners phone on Telstra.
She hardly uses it and was going over her 1Gb limit 2 and 3 times in a monthly billing cycle, which NEVER used to happen and her usage hasn't changed.
Only Telstra never treated her so nice, instead they charged her an extra $20 for each additional 1Gb
Hence why she is now an Optus customer on 10Gb a month for $40.
I've often wondered how Data Usage is collected by providers, as before the days of unlimited data, i used to find huge discrepancies.
Of course, you can claim all you like, they are not interested in listening.
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