Wis. Admin. Code DWD § 140.18
No representative may charge or receive from a claimant for representation in a dispute concerning benefit eligibility or liability for overpayment of benefits, or in any administrative proceeding under ch. 108, Stats., concerning such a dispute, a fee which, in the aggregate, is more than 10% of the maximum benefits at issue unless the department has approved a specified higher fee before the claimant is charged. When a request for waiver of the 10% limitation is received, the department shall consider whether extended benefits or any other state or federal unemployment benefits are at issue. Any request for waiver of the 10% limitation on fees shall be submitted in writing to the central administrative office of the bureau of legal affairs in the division. Under s. 108.13, Stats., the department may not assign any past or future benefits for the collection of representative fees.
Wis. Admin. Code Department of Workforce Development § DWD 140.18
Any request for a waiver under this section shall be submitted in writing to: Department of Workforce Development, Division of Unemployment Insurance, Central Administrative Office of the Bureau of Legal Affairs, 201 E. Washington Avenue, P.O. Box 8942, Madison, Wisconsin 53708-8942.