dont no.

going to seize my car with the police, says he is a baliff. uses name rock beaudin

Impersonating a court officer is a crime.  Bailiffs do not repossess cars. With the scant information you posted, there is very little more that I can tell you.  It would be counterproductive for them to call and warn you though.  You can call the county courthouse up and ask them if they have a bailiff by that name.  I am pretty sure they never heard of him.

He said his name was Rock Beaudin from the ``MINISTÈRE DE LA JUSTICE`` Went strait to voicemail no answer