1. I would say, if they are just medic whoring at spawn for rating only, take demo and get there GUID using \pb_plist. Share the GUID here, so other server admins can keep an eye on this whoring rating players.
2. Report it here so TB staff can look in to it and decide to disable his rating or not.
3. Report it on forums who run that server. If every player or most of the players are found 'medic whoring' on any server for 'rating', disable the rating on server and blacklist the server, till that server admin fixes the issue.