70.14. If the employee receives benefits that are greater or lower than those to which he is entitled, the Commission must,
(1) in the case of underpayment, pay the due amount within 2 months of receiving the report provided for in section 70.11,
(2) in the case of overpayment, deduct the amount of the overpayment from the benefits it pays to the employee within 12 months after the anniversary date contemplated in section 70.11.
No interest is exigible on any underpayment or overpayment.