If you have specific questions based upon the content of the notice you received from the Department of the Treasury, Financial Management Service, please call the 800 number listed on the bottom of the notice. If you are disputing that you owe this amount and believe that the offset was not valid, you need to provide documentation to this office so that we may review your claim. Send your documentation, such as court orders and/or payment ledgers along with a copy of the notice to: Child Support Program, Attention Treasury Notice, P.O. Box 19152, Springfield, Illinois 62794-9152. If you recently provided us with documentation supporting your claim, you do not have to provide it again. If you already have an appeal scheduled with the department's Bureau of Administrative Hearings, you should take the notice to your hearing.