Unable to add new payment card

[DPL1954]

I'm trying to add a payment card. After selecting my address I get a message 'Loading Information' and a circling clock but nothing else.

[MI5 · Accepted solution]

@DPL1954 

You could try calling customer service to add it for you.
Numbers here Guide: Coronavirus Community Help and Support 
Advice from an O2 Guru regarding a way to get through:
When it comes to the reason you are calling stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say "Upgrade", "Lost/Stolen" or "Fraud" if you have to, to get put through to someone.
8.00am is the best time to call if you can.