Wis. Stat. § 425.307: Limitation of action.

(1) Any action brought by a customer to enforce rights pursuant to chs. 421 to 427 shall be commenced within one year after the date of the last violation of chs. 421 to 427, 2 years after consummation of the agreement or one year after last payment, whichever is later, except with respect to transactions pursuant to open-end credit plans which shall be commenced within 2 years after the date of the last violation; but no action may be commenced more than 6 years after the date of the last violation.

(2) Rights under chs. 421 to 427 may be asserted as a defense, setoff or counterclaim to an action against the customer without regard to this time limitation.