@AnnaliseAre you still with o2, and did you move the old PAYG number to Pay monthly?
If you did then the old payments will stop automatically.
If you didnt you will need to remove the payment method from the old number in myo2 or by calling Customer Services on 4445
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iPhone 16 Pro Max - o2 and Spusu
Galaxy Z Fold 6 - Mozillion
iPad Pro 11 M4 - Three
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company