Whenever the commission shall find upon investigation that any public service company is giving effect to any such contract or arrangement without such contract or arrangement having been filed or approved, the commission may issue a summary order prohibiting the public service company from treating any payments made under the terms of such contract or arrangement as operating expenses or as capital expenditures for rate or valuation purposes, unless and until such contract or arrangement has been filed with the commission or until payments have received the approval of the commission.