Currently, it seems that your policies are in violation of CAN SPAM act because when you lock up people's accounts they lose access to unsubscribes. They are therefore unable to remove those people from their lists causing violations as a direct result of your policies.
It would be wise to review the legality of holding data hostage in this manner as the customer's data belongs to the customer, not you.
We see that you were able to speak with our Compliance team regarding your unsubscribed contacts and they were able to provide you with those contacts.
We work hard to stay in compliance with all spam legislation worldwide. You can review our anti-spam policy on our website at any time. If you have further questions about how we stay in compliance with these policies, we want to hear from you! You can email legal(at)constantcontact(dot)com or speak with our Compliance team at the hours and times listed here.