(a) Issuance. The Deputy Solicitor of Labor shall institute enforcement proceedings by issuing a complaint and causing the complaint to be served upon the respondent.

(b) Contents. The complaint shall contain a clear and concise factual statement sufficient to inform the respondent with reasonable definiteness of the types of acts or practices alleged to have occurred and to violate section 41 of the Act or the provisions of parts 1915 and 1918 of this subtitle.

(c) Amendments. At any time prior to the close of the hearing, the complaint may be amended in the discretion of the hearing examiner and on such terms as he may approve.

(d) Notice of hearing. The hearing examiner shall notify the parties of the time and place for a hearing within 10 days after the service of the complaint.