As far as I know, early cancellations have to be done on the phone via CS. You could try going into a store and getting them to call CS for you as they always seem to be able to get through quickly (I think they have a different number to call ;))
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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