Every state bank, savings bank, trust company, savings association, debt management services provider, debt settlement services provider, and other financial institutions shall be at all times under the supervision and subject to the control of the commissioner of commerce. If, and whenever in the performance of duties, the commissioner finds it necessary to make a special investigation of any financial institution under the commissioner’s supervision, and other than a complete examination, the commissioner shall make a charge therefor to include only the necessary costs thereof. Such a fee shall be payable to the commissioner on the commissioner’s making a request for payment.