40-5-307. Delinquency of child support denied -- hearing. If, within 15 days after service of a notice under 40-5-305, the obligor responds to the notice and denies that income withholding initiated because of a delinquency is proper or denies that the amount or arrearages stated in the notice is owing, the district court shall hold a hearing to determine whether income withholding will take place or continue.