1. call Community Legal Services. It is free service if your kid born here.
Address
305 S. 2nd Ave.,
P.O. Box 21538
Phoenix, AZ 85036
Phone: (602) 258-3434
Toll Free: 1(800) 852-9075
http://www.azlawhelp.org/resourceprofile.cfm?id=18
2. AZ attorney general child support enforcement program is excellent.