TWC is usually issued when the activity is not enough for a ban but is suspicious and is simply a way of saying, be extra careful when trading with this user. You can always PM a moderator about your TWC reason or dispute it if you think you don't deserve it. You can have your TWC removed, but you must show a reform of character, good posting around the community and accumulating vouches which show you are reliable and honest. Only then would I recommend you ask for removal. After all, they are there for other members safety.