The only joint-less bone in the human body is the hyoid.
When a Stickleback fish feels threatened, it will flare out its pair of pelvic spines and three dorsal spines, making it difficult for predators to swallow them.
The approach that will be most effective IS TO HAVE THE CLIENT ADDRESS NEEDS TO THE STAFF PERSON ASSIGNED.
In the scenario given above, the best way to handle the client is to assign a staff person specifically to him to cater for all his needs. The clients should be informed that he should approach this staff alone for all his requests and needs.