Your rebilling was already turned off and you are paid through 10/17/2018, so you will have that service through that day and then your account will go back to free features. There is nothing more for you to do. If you decide to join Premium again, you can do that at any time by going to that preference page.
Hope that helps!
"Obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it." - Michael Jordan
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