First off, this is happening in France (although any advice is welcome).
Last December, as I was driving home on my motorbike, a car suddenly changed lanes and cut me off. Despite trying my best to avoid the collision, the accident occurred leading to the bike being severely damaged and me having a few bruises.
Fast forward 2-3 weeks during the Christmas holiday, I get a call from the expert sent by the insurance company. This guy is supposed to determine whether the bike can be fixed or not. Long story short, he tells me the damage on the bike leads him to say I was performing a wheelie when the accident happened and that I am thus responsible for it.
At this point, it might be worth saying that the road the accident happened on is very crowded and that a wheelie is not even practicable (if we set aside the fact that I can't even perform one). Also, the expert was evidently not present during the accident and only speculates on the circumstances.
Of course, I explained that his expertise is erroneous but he kept saying that I am the one responsible for the accident. I have a couple witnesses in addition to the other driver saying orally she was at fault.
Now I have discussed a lot with fellow bikers and it is pretty obvious the expert either is incompetent or simply lies to put the blame on me.
My question is: can I actually sue the expert for his wrong (and very questionable) expertise?
Don't get me wrong. I'm not into legal proceedings but I gave the expert many opportunities to revisit his (obviously wrong) assessment. His statement to the insurance company has been directly damaging (I have expenses that won't be covered by the insurance because of his nonsense) and I don't want such an incompetent (dishonest?) person being allowed to harm others.
This is not a question to know if I am accountable for the accident.