You can cancel a Reason+ monthly subscription anytime, according to this article.
After requesting cancellation, your Reason+ subscription will continue until your next billing date. Subscription fees paid prior to cancellation are non-refundable.
Reason+ 1 year prepaid/Reason+ special offer 1 year prepaid:
You can request cancellation and a full refund within 30 days of payment.
After 30 days from payment, you are committed to the full duration of your subscription term and no money will be refunded.
Please contact Customer Support to request a refund.