Dear Customer, thank you for choosing Just Answer. I am sorry to learn about this unfortunate experience with your motorhome. From the statement of facts as you have provided them, the mechanic appears to have potentially engaged in a series of unlawful acts, including fraud, breach of contract, and conversion (the theft of your vehicle). You can sue to recover your auto in civil court (depending on the value you could sue in small claims, but Wisconsin small claims has a cap of $10,000.00 so anything higher than that will have to go to general civil court).
If you want additional information on your rights in Wisconsin, as well as the proper department to call if you want assistance prior to filing a lawsuit, please review this publication by the state government, it outlines some of the basic rights for auto repair, as well as your potential damages claim (double the cost of repair) in your state: http://ww2.wisconsin.gov/san/agency/upload/doa/consumer/crrpp202.pdf
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