Recieved this email about a day ago:

Thank you for your recent email to our Customer Service Department and providing your account information so that we may access your account. Please disregard that billing statement that states that you owe a balance with Mediacom Communications. You actually have a credit refund on your account this should be on its way to you very soon.
If you need further assistance or have any additional questions please feel free to contact us via e-mail and we will be happy to assist you, but please be sure to include your original email for reference. Or you may contact us through our Customer Service Department at 800-332-0245, open 24 hours a day, seven days a week for your convenience.
Thank you.
Ben S.
Mediacom Customer Service
E-Mail North Central Division

Certainly not a direct answer to my question, but does lead to the right resolution.