(1) All persons under court order to pay support on August 1, 1985, who become delinquent in an amount equal to the total court-ordered support payable for thirty (30) days shall be subject to the income withholding provisions of this subchapter. An order of income withholding shall become effective when the requirements set forth in § 9-14-221 have been satisfied.
(2) The only ground to contest an order of income withholding effective under § 9-14-221 shall be mistake of fact.