The commissioner may suspend, revoke or refuse to renew any license issued hereunder, upon 10 days' notice in writing, forwarded by registered or certified mail to the principal place of business or residence of such licensee, stating the contemplated action and in general the grounds therefor, after reasonable opportunity to be heard, if he shall find that the licensee or any owner, director, officer, member, partner, employee or agent of such licensee has:
(a) Made any material misstatement in the application;(b) Knowingly or without the exercise of due care failed to comply with or violated any provisions of this act;(c) Defrauded any retail buyer or willfully failed to perform any written agreement with any owner;(d) Willfully misrepresented or failed to disclose any of the material particulars or the nature thereof required to be stated or furnished to the owner under this act;(e) Knowingly taken any instrument evidencing a home repair contract which was signed in blank; or(f) Otherwise demonstrated lack of financial responsibility, unworthiness, bad faith or dishonesty.L.1960, c.41, p.171, s.23.