No action to revoke or suspend a license or permit shall be taken until the licensee or permittee has been furnished a statement in writing of the charges against him or her, together with a notice of the time and place of the hearing. The statement of charges and notice shall be served upon the licensee or permittee at least 20 days before the date fixed for hearing, either personally or by registered or certified mail sent to his or her last known physical home or office address or post office address, or any combination of them.