How to remove iTunes Billing as Netflix payment method (Answer: call Netflix)
Netflix billing through iTunes is no longer available for new or rejoining members. If you are currently billed through iTunes, you can remain on iTunes until you update your payment method or cancel your account.
To the right of subscriptions, select Manage. To the right of the Netflix subscription, select Edit. If you don’t see a Netflix subscription and are still being charged, make sure that you’re signed in with the correct Apple ID. If so, you might have subscribed directly through Netflix and not through iTunes.