Why was my flag denied?
You didn't have any accepted trades between you and the person you flagged on BC Rank.
You flagged a person who unaccepted within 24 hours of accepting the trade.
You attached screenshots that were not legible, or didn't provide enough proof of the infraction. You must prove that you made an effort to contact the user in-game and on Facebook and that they backed out after 24 hours of accepting the trade.
You changed the terms of the trade after 24 hours.
You didn't exchange screenshots of your monsters within 24 hours and noticed their monster had the wrong active and/or passive at trade time. This is your fault!
You participated in a multi-monster trade and you were scammed. These type of trades are at your own risk!