Hello and thank you for contacting Just Answer. We appreciate the opportunity to be of service to you.
You will have to contact the Tax Assessor in the City of New Milford and tell them of the discrepancy. They will inform you of the steps necessary to resolve the matter.
Here is a link to that Office:
The following link is to the section of the Connecticut Law that addresses "Certificates of Correction"
Section 12-57 Chapter 203 Personal Property Tax Assessment
If you have any further questions on this matter please get back to me.