Did you port your number from another network @PH19 ?
If yes, you might have something called a split port, which o2 would need to resolve.
See if the community guide below helps:
Guide: Text Message Tips (not sent or received)
If not, then try customer services on social media:
Guide: How to find help & contact O2
Not sure why you need to travel to London to find an o2 shop though...
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
