Fractional
Sounds to me like you have a problem that your flight ops management team should be dealing with. If a crew member refuses to operate, even if you, on the day, have 200 passengers stranded, then its surely up to his management team to deal with the issue, if there is one to deal with. If it's a straight refusal to use discretion, not a great deal you can do about it I'm afraid.
Its frustrating I know, been there many times,.