This maybe because you did not quit your membership. In other words, the website supports the auto renewal of your membership (until you change the settings in My Profile). This is proved by the terms of use, “in order to provide continuous service, we automatically renew all paid subscriptions for the Services on the day such subscriptions expire... renewals shall be (i) for a period equivalent to the period of your initial subscription... and (ii) ...at the price of the same or comparable Services then in effect. In addition, we sometimes offer special promotions that have renewal periods of different duration than the original subscription term. We… communicate renewal periods to you upon confirmation of your subscription and in the body of any special promotions that have renewal periods...”