@wini
Arrow left (button at the top of the remote, not round the centre), and confirm that you want to leave Now.
This will drop you into the ‘Roku’ menu. there you will find Settings, then System, then Software, then Update (or maybe Update directly).
Do this, and even if there is no System update, it will update any apps for which updates are pending.
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.
