You just have to persevere. They are busy now. Try at 8am.
*The Game Is On*
did you make any changes to your account around the time it stopped working such as a tarriff change? a move to sim only?
what device are you using? did you get the phone as part of the contract or are you using a phone that you got seperately from your sim?
Track usage, upgrade and get support with the My O2 app