D.C. Code § 31-4303

Whenever it appears to the satisfaction of the Commissioner that, because of some error, mistake, or erroneous interpretation of a statute, a company has paid fees, charges, or taxes in excess of the amount legally chargeable against it, the Commissioner shall, on application of the company, present the matter to the Mayor, with the view of refunding to such company any such excess, or applying the excess or portion thereof toward the payment of fees, charges, or taxes already due from such company.