Upon his own motion or upon complaint being filed by a citizen of this State that a company authorized to do business in the State has violated any of the provisions of Articles 1 through 64 of this Chapter, the Commissioner shall investigate the matter, and, if necessary, examine, under oath, by himself or his accredited representatives the president and such other officer or agents of such companies as may be deemed proper; also all books, records, and papers of the same. In case the Commissioner shall find upon substantial evidence that any complaint against a company is justified, said company, in addition to such penalties as are imposed for violation of any of the provisions of Articles 1 through 64 of this Chapter, shall be liable for the expenses of the investigation, and the Commissioner shall promptly present said company with a statement of such expenses. If the company refuses or neglects to pay, the Commissioner is authorized to bring a civil action for the collection of these expenses. (1899, c. 54, s. 111; 1903, c. 438, s. 11; Rev., s. 4694; C.S., s. 6277; 1921, c. 136, s. 4; 1925, c. 275, s. 6; 1945, c. 383.)