(Bit of an accidental vote cos I couldn't figure out how to cancel it)
The FD had a data SIM with a 25GB allowance. For whatever reason, that became interpreted (or misinterpreted) as 'unlimited', even though their filing mentions the allowance, and what happened if that was exceeded.
Somehow, this has become part of the 'Net Neutrality' holy war and mythology, even though it was a simple case of the customer not understanding their contract. And personally I think the 'U' word should be banned in telco service contracts because they never are, or could be in all circumstances. But hey, that's marketing (Obligatory RIP BIll Hicks)