(a) The unauthorized or unlawful practice of any profession, occupation or calling by any person, firm, or corporation may be enjoined by any court of competent jurisdiction on complaint brought in the name of any public body or officer having authority conferred by statute to regulate or to license the activity engaged in by such person, firm, or corporation.
(b) The provisions of this section are cumulative. The authority conferred by the section is in addition to and supplementary to all other statutes, civil and criminal, dealing with the subject matter of this section. The section shall apply retrospectively and prospectively.