That's your fault, not his. You could have, and should have, insisted on a written lease before you took the place or just walked away. Once you accepted the place without one he had no further obligation to give you one.
I'm guessing you never bothered to read the WI landlord tenant statute, part of which gives you legal remedies for lack of proper repair, provided you used the proper procedures outlined in the statute.
http://law.justia.com/codes/wisconsin/2013/chapter-704/
You probably didn't do that according to the statute either and all you're succeeding in doing is getting yourself evicted.
I agree with Mr K that you should pay your rent.
Then follow the statute going forward.

