The system is designed fairly so that you will only get power here by proving first how reputable you are through good deeds and multiple successful transactions with other user with proof.
Vod attached reference on his tag to you which is valid. His DT power can be easily removed once he show an abused by excluding him to the trust list of the other DT. Forum DT works perfectly on anonymous environment like Bitcointalk. It’s not unfair with newbie, If you don’t want to get tagged then don’t do shady things like what you did because it’s an obvious fake feedback for your service.
You can request to remove the negative feedback to the user that gives it to you by admitting your mistake and don’t do it again. But it needs time for Vod to rethink about it.