We only suspend accounts due to lack of payment after several attempts to run the card on file and after multiple attempts to contact you.
You can update your payment method at any time. Simply go to Settings--Invoices and Subscriptions--Update Payment. Your account can be reactivated upon successful payment.
If your account is in good standing with billing, please email us at firstname.lastname@example.org and we can look into your account to see more specifics.