Cool Tabs plans are non-permanent, so you can cancel at any time. Monthly and annual subscription renewals will be done automatically every 30 and 365 days, respectively.
Once a payment has been made, there is no refund. What we do in these cases is, if you don't need to use the plan at the moment, keep that monthly plan until you need it.
Write us at firstname.lastname@example.org, so we can cancel your plan and move your account to the Free plan. And, when you require it again, contact us again, so we can reactivate it for you.