It’s when you can read an answer like that, and nod, and go ‘Yes, that’s the way to do it’, instead of ‘WTF?!!?’ that you know you have been fully assimilated into the Now borg…..
Set a Payment PIN on your account so that no-one but you can buy memberships on it. Check your bank accounts monthly for any other unexpected payments to Now. That way you can at least nip them in the bud, while you and Now figure out whose fault they are.