undoing the deal still requires to have a deal in a first place, that in fact did already occur. As your attorney I advise OP not to listen to before mentioned.
And I advise the OP to get a new attorney...
While I agree that a deal undone should be fair game for feedback, I have seen posts to the contrary. (I don't remember WHO posted them, though.) Regardless, contacting a moderator about such conflicts is generally considered an appropriate option... if for no other reason than so they can be aware of the person's activities.