If you're interested in cancelling your CBS All Access account, there are a few things you should know. First, cancelling your account will not automatically refund any charges that have already been incurred. You'll need to contact customer service to request a refund for any past charges. Additionally, if you cancel your account before the end of your current billing cycle, you'll still have access to CBS All Access until the end of that billing cycle. So if you're planning on cancelling, be sure to do so at a time that's convenient for you.
To actually cancel your account, log in to yourCBS All Access account and select the Billing tab from the top navigation bar. From there, scroll down to the bottom of the page and click on the Cancel Subscription link. You'll be prompted to confirm your cancellation; once you do, your subscription will be cancelled immediately and you'll no longer have access to CBS All Access content.