Call 1-800-377-1904
Voice mail available 24 hours a day
Fax: (630) 574-7788
Office Hours:

Mon - Thu: 8:00 a.m. - 9:00 p.m. CST
Fri: 8:00 a.m. - 5:00 p.m. CST
Sat: 8:00 a.m. - 12:00 p.m. CST

Please have the following information ready when you call:

Credit card number and expiration date
Credit card's 3-digit verification code
Customer service phone number on back of your credit card
Billing address and phone number
ERS account number (if available)

Please have the following information ready when you call:

Bank routing number
Checking account number
Check number to be used
Bank's name, address, and phone number
ERS account number (if available)