I think someone who is paying their debt to society should be focusing on their rehabilitation plans. They should not be spending their time filing complaints through the complaint process, bogging it down, and causing a real hardship on our hard-working front-line correctional officers.
I think by stopping them from doing so, by labelling them as a vexatious complainant, it's going to address the issue of them using it as a tool or a game, almost like a petulant child would do. I think labelling them, providing them with the plan, the generic document that says why they've been given this designation and what they need to do to prove that when they file legitimate complaints they will be heard.... But in the future they're not going to be able to file complaints that have no merit.
Additionally, of course, this also is going to allow legitimate complaints to be processed more efficiently. The time that would be spent with complaints that are of no merit could be spent on actually dealing with those that need attention.