Unlikely to be o2 tbh. These are usually 3rd party companies trying to get your business.
Just block the numbers on your handset.
If o2 need you they will text or email you too.
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)