Whenever, in the opinion of the Department, a person violates any provision of this Act, the Department may issue a rule to show cause why an order to cease and desist should not be entered against that person. The rule shall clearly set forth the grounds relied upon by the Department and shall allow at least 7 days from the date of the rule to file an answer satisfactory to the Department. Failure to answer to the satisfaction of the Department shall cause an order to cease and desist to be issued.