Netflix cancelations take effect on the next billing cycle. If you're due to be billed on the first of the upcoming month but cancel on the 15th, you'll still have access to Netflix's content until the first. Unfortunately, delays can occur when canceling, which means that if you cancel your subscription within one or two days from the renewal date, you may see another charge. Once you've canceled your membership, verify that you have correctly completed the cancelation by checking your email. You should receive a confirmation email. If you didn't receive one, log into Netflix and check that your membership shows an expiration (there will be a notice listed). Lastly, if you're positive you canceled your account on time and canceled the correct one (you may have multiple), contact Netflix Support for help. Netflix's official stance on refunds is that they do not offer them, but if you got billed incorrectly, it's worth reaching out to get your money back possibly.