There are no contact numbers for CSC, you can call National Customer Service Center.
National Customer Service Center (NCSC) at 1-800-375-5283 (TTY 1-800-767-1833). This toll-free call center has additional information and, during their specified office hours, can connect you to live assistance in English and Spanish. The NCSC will be able to answer most questions - although they cannot provide information about the status of your case over the telephone.
http://www.uscis.gov/portal/site/uscis/men...00045f3d6a1RCRD