No person may attempt to collect an obligation by communicating in any way with an employer with regard to the obligation owing by one of his employees unless there has been a default of the payment of the obligation for at least 30 days and at least 5 days prior notice of the intention to communicate with the employer has been given to the employee. Any person violating this Section commits an unlawful practice within the meaning of this Act and, in addition, is liable in a civil action for damages resulting to the employee about whom such a communication is wrongfully made.