You're receiving the reminders because you signed up for a monthly subscription. Even though your promotion code covers a period longer than one month, your account is set for automatic renewal each month and the system sends out an email reminder about that. Don't worry though: the system takes into account your discount as long as you're within the period that the promotion code covers. It's important to keep note of when your free period expires so the charges to your credit card don't surprise you! All of the subscription information is clearly displayed on the Pricing Plan page for your account, including the selected plan, cost, billing schedule (monthly, annual), and any promotions applied.