It depends if the person putting it through made a mistake or if the device is fully paid off.
O2's policy, as you are fully aware, is to not yet generally allow the unlocking of the 7+
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)