There was a similar case here just a couple of months back. In this case the man was trying to get back his child support monies after learning the child was not his. The municipal court decided in his favor, but this decision was overturned by the Court of Appeal. In Finland there's still one court higher than these, but I don't know if the poor fella was granted the permission to present his case there.
Sometimes it just sucks to be a man.