To start out, I've read the post of another person who was sued by MF, LLC (hey, I like that set of initials, describes them quite nicely :) ) in the state of Wisconsin.
Here's the order of events of what happened for me:
1. Got a letter from a really scamy looking "arbitrator" wanting me to sign "limited power of attorney" over to them (Yeah, right.) Don't have the forms anymore as they went straight into the shredder. Looking back that may not have been the brightest idea I've had, should have stuck them in the safe for later use. This was for arbitration between me and MF, LLC.