The contact details for our Billing department are listed below:Toll Free Telephone Number:1-877-247-3843 Ext. 401Email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Fax Number:1-630-925-4701Secure Fax Number:1-866-299-4385Postal Address:BIRDVIEW Technologies101 W. 22nd Street, Suite 202Lombard, IL 60148