Q: How can you remove a credit card from your account?

On the Edit Payment Information page, select "None" from the list of credit card types. This will delete your billing information.

There is no "none" buttons from the list of credit card types

I have the same problem.My little son made many transaction by mistake {{{{{ there is no none option in the payment page

See if this support document answers your question. Why can’t I select None when I edit my Apple ID payment information? - Apple Support