I've just checked one of my contracts which has an extra data bolt on and it's all shown on the main allowances page.
Yours might be because the contract is new and may correct itself after your next bill, but you can always call 202 and ask customer service to look at it for you.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion.
This is not Customer Service so we are unable to help with account specific issues.Currently using:
Pixel 7a (O2 & Lyca), One Plus 6 (Sfr), iPhone 12 Pro Max (Vodafone)