30 ILCS 430/6
If the State fails to pay the principal of or interest on any Retirement Savings Bonds or premium, if any, as the same become due, or shall fail to make any required monthly transfer of funds to provide for the payment of such principal, interest or premium, a civil action to compel payment may be instituted in the Supreme Court of Illinois as a court of original jurisdiction by the holder or holders of the Retirement Savings Bonds with respect to which such default of payment or failure to make a required transfer exists. Delivery of a summons and a copy of the complaint to the Attorney General shall constitute sufficient service to give the Supreme Court of Illinois jurisdiction of the subject matter of such suit and jurisdiction over the State and its officers named as defendants for the purpose of compelling such payment or transfer. Any case, controversy or cause of action concerning the validity of this Act relates to the revenue of the State of Illinois.
If the Supreme Court of Illinois denies the holder or holders of Bonds leave to file an original action in the Supreme Court, the bond holder or holders may bring the action in the Circuit Court of Sangamon County.
30 ILCS 430/6