740 ILCS 170/4.3

If any person wrongfully: (1) serves a notice on an employee or serves a notice which does not conform with the requirements of Section 2.2, (2) causes a demand to be served for the wages of an employee, or (3) fails to release a demand, he shall be liable to the employee and the employer for statutory damages in the sum of $500 and all actual damages occasioned by such action including reasonable attorney's fees.