Pay as you go (card removal/prevention)

[charlie16]

A relative has a pay as you go system, which is connected and charged to my card. However, sometimes this relative unexpectedly buys more 4G on my card without my permission. Is there anyway that I can prevent further transactions or control it?

[Bambino]

@charlie16 If you've given permission to your relative there's nothing O2 can do. Speak to your bank. You'll have to get the permission removed. That may entail you being issued a new card with a new number, but that would be best decided by your bank.