The Public Counsel may receive a complaint from any person concerning an administrative act. He shall conduct a suitable investigation into the things complained of unless he believes that:
(1) The complainant has available to him another remedy which he could reasonably be expected to use;
(2) The grievance pertains to a matter outside his power;
(3) The complainant's interest is insufficiently related to the subject matter;
(4) The complaint is trivial, frivolous, vexatious, or not made in good faith;
(5) Other complaints are more worthy of attention;
(6) His resources are insufficient for adequate investigation; or
(7) The complaint has been too long delayed to justify present examination of its merit.
The Public Counsel's declining to investigate a complaint shall not bar him from proceeding on his own motion to inquire into related problems. After completing his consideration of a complaint, whether or not it has been investigated, the Public Counsel shall suitably inform the complainant and the administrative agency involved.