Wisconsin doesn't have a specific auto-renewal law, but the DTPA (no specific auto-renewal law) (Wis. Stat. § 100.18) plus federal FTC rules protect your right to cancel.
Wis. Stat. § 100.18
Penalties: Pecuniary loss doubled plus attorney fees
SubScrub automatically cites Wis. Stat. § 100.18 and federal laws