I'm on a break whilst on duty providing radar control all evening. If I gave someone a vector under RC and the captian declined to take the control instruction without a very good reason. I would move the conflicting traffic out of his way and ask for a relief so I could file against him.
Radar Control takes precedence over rules of the air such as each altering course to the right IMHO.
And no, I am not a filer by nature, been controlling 17 years and have never filed against a pilot.
DD