Did you give o2 any notice that you wanted to stop your services @Jack2107 ?
Contracts don't just end - they have a minimum period, after which you can end it but you need to tell o2 that's what you wanted to do.
See some help in the guide below.
Guide: Cancelling Your Contract
You might also want to check your phone is unlocked to use elsewhere.
Guide: Unlocking an O2 phone to use a different SIM card
Please note, this is not customer services and we cannot access your account. Do not publish personal details (email, phone number, bank account).
Link to our guide on how to contact them can be found here
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