Request to deactivate automatic prepaid top-up

Hello, I am using an O2 Prepaid card. I have already cancelled my direct debit mandate from my bank account (Wise) because I want to recharge manually whenever I need.However, I cannot find the option to turn off "Automatisches Aufladen" on my account dashboard. Could a support moderator please deactivate the automatic direct debiting from my bank profile on your side? Thank you!