You can cancel their subscription by logging in, navigating to Account–> Subscription and clicking “Cancel Full Subscription”.
Cancellation takes effect at the end of your billing cycle (or 5th day for paid subscriptions). Discounts, codes, and promotions won’t apply when resubscribing. Subscriptions renew automatically each month; upgrade/downgrade anytime.
Fraudulent activity or violation of TOS may result in suspension/termination without notice.