The Commission is empowered to make an examination in any case in order to determine whether a stop order should issue under subsection (d). In making such examination the Commission or any officer or officers designated by it shall have access to and may demand the production of any books and papers of, and may administer oaths and affirmations to and examine, the issuer, underwriter, or any other person, in respect of any matter relevant to the examination, and may, in its discretion, require the production of a balance sheet exhibiting the assets and liabilities of the issuer, or its income statement, or both, to be certified to by a public or certified accountant approved by the Commission. If the issuer or underwriter shall fail to cooperate, or shall obstruct or refuse to permit the making of an examination, such conduct shall be proper ground for the issuance of a stop order.