You'll need to call O2. on 4445 or any other number in the guide below
Numbers here Guide: Coronavirus Community Help and Support
Advice from an O2 Guru regarding a way to get through:
When you call, you will be asked for 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 an advisor.
Press Upgrade, Lost/Stolen or Fraud if you have to.
8am is the best time to call
*The Game Is On*
It sounds like your daughter is on one our bundle pay as you go. This is where the credit applied will be taken and in return, you will receive calls, texts and data.
To check this call 4444, followed by option 2, then option 2 again. It will then read out how many calls, texts and data you have. If it does then it means the credit has been turned into the bundle for 30 days.
To check the balance of any remaining credit is 4444, followed by option 2, then option 1.
If neither are showing your credit, drop the customer service team a call on 4445