In the performance of his assigned functions the advocate shall have reasonable access to records of all state agencies which are not classified by law as confidential and all state agencies shall cooperate with the advocate in the performance of his duties. In addition, the advocate shall have reasonable access to confidential records and information, provided he enters a proprietary agreement to insure their confidentiality. The South Carolina Department of Insurance and advocate also have access to records, information, and data of the insurance companies as well as all of their sister affiliates, subsidiaries, and parent companies. During the course of a rate making or other proceeding before the South Carolina Department of Insurance or the Public Service Commission, the Consumer Advocate, as a party of record, may request in writing, in addition to all other methods of discovery as provided by law for proceedings before the South Carolina Department of Insurance or the Public Service Commission, the issuance by the director of the Department of Insurance or the executive director of the Public Service Commission of an order compelling a witness or company to either produce or allow inspection of documentary evidence relevant to the matter before the South Carolina Department of Insurance or the Public Service Commission. If the executive director issues or refuses to issue the order, the aggrieved party may appeal to the full commission. The written request, in addition to showing a general relevance and reasonable scope of the evidence sought, must also specify with particularity the books, accounts, papers, records, or other materials of the business desired and the facts expected to be proved thereby. For good cause shown, in lieu of a written request, the request for such an order may be made orally upon the record to the presiding officer at the hearing. Any objections to the issuance of the order must be filed with the commission within three days of being notified of the written request or such order. Any objections so filed must list the specific grounds for objection. The commission shall rule on the objections within ten days or the objection is denied.