Unless a reason exists whereby it is not possible, if the conduct of an MSC is unacceptable, simply "kick 'em to the curb." Every company with whom I currently complete work pays me as agreed, communicates when necessary and is not, in the slightest, disrespectful toward me. In the past, it has been necessary for me to, all too frequently, follow the above advice. I regretted the need to take the actions, but never the kick itself.