Upon receiving any complaint as to any false or misleading statement as described in Section 731.05, the City Manager shall forthwith investigate and make demand for access to all books and papers pertaining to the business of the licensee, which may assist the City Manager in determining whether or not a false or misleading statement has been made, and further, he may put under oath any person who may have any connection with the business of the licensee and command such person to answer any questions that may be necessary to obtain the true facts. (1947 Code, Sec. 5-196.)