Unfortunately only O2 can resolve this for you
Has the number been disconnected on your Vodafone sim @Jonathan1289
You need to call O2
You can use Skype to call.
All numbers including Skype are in this guide
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
Track usage, upgrade and get support with the My O2 appDownload My O2