Tariffs below 250 gigabytes get their allowance doubled.

Tariffs of 250 gigabytes or more are upgraded to unlimited data.

So your arrangement is effectively 250 gigabytes classic base O2 tariff, volt supercharge benefit, unlimited data.

That is also consistent with the O2 agreement, which says the volt terms become part of your agreement once an eligible order has been accepted for supercharging.

Describe the sim as unlimited town.

The 250 gigabyte figure you see in the order email is the underlying tariff before the bulk benefit is applied.

O2's own example specifically shows 250 gigabytes plus unlimited.

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You're paying 2199 virgin volt gig one 1001 1100 and feet down 104 megabit parts up. £10 out.