@Tammy3How do you mean its trying to charge you for a bill you don't have.
Did you have a previous contract and not cancel it at the end of the minimum term?
I would suggest calling o2 on 202 from your handset or by live chat if/when available from
https://www.o2.co.uk/contactus
- Xperia 1V - o2 and Spusu
- Pixel 8 Pro - o2 and Vodafone UK