Sold a car and buyer flipped it and title jumped

Posting for my husband. Last week, he sold a car that needed quite a bit of work. It was heavily discounted due to being a project or parts car (about 50% of KBB value). Had a guy come and pay cash after inspecting it, he had it towed from our property later the same day.

Yesterday, a woman reached out saying that she bought the car from someone claiming to be my husband (used his full name in their interactions). He had made some repairs so the car is more functional, but after looking at the title the final buyers realized that something wasn’t adding up due to the dates, and they also found service records in the glovebox that went back many years. The guy we sold to said he had just bought the truck so they started to suspect something was off, looked up my husband’s Facebook page and realized he looks nothing like the seller.

Basically my husband filled out his part of the title/signed it over - but the guy we sold it to didn’t fill it out or register the vehicle and just impersonated my husband to sell it to another party.

We are in the state of Wisconsin. We’d like to prevent this guy from doing this again as he not only impersonated my husband but title jumped the car and scammed these poor buyers who seem like nice people. Should we report him to the DMV and/or pursue legal action? Any feedback would be super helpful.