I've been with Maritz for many years. Like Mert, I do not return phone calls or the seldom Emails for offered shops if I'm not interested in doing them. OTOH, I do continue to work with them on a weekly basis. 
I do, however, return calls and the infrequent Emails when it is a request for anything that is germane to my relationship between Martiz and myself.
So, i agree that you should call, not Email, Maritz and speak to someone in the know (a supervisor, etc). I think I would just explain if I've been deactivated that I would still like Maritz to consider me as a possible contractor.