Customer services representatives are consistently answering telephone inquiries, Monday through Friday, 8 a.m. to 5 p.m. EST. Due to the number of inquiries, you may have to wait to speak with a representative or try your call again. You can obtain information about payments, arrears, and certain case actions from our automated Interactive Voice Response service. Fax numbers and mailing addresses for child support offices are also available through the voice response service.