Behodar:

 

Has anyone figured out how to "unlink" the existing credit card? The email says you can pay by direct credit but presumably I won't get an option for that if there's a credit card saved.

 

The e-mail I received states "By loading a direct debit, you will override your stored credit card option."

Doesn't answer the question if it's unlinked at all, but I consider switching to direct debit to have fully revoked any consent to use the card.