He blackmailed me and saying I blackmailing him. Well, I didnt discuss this issue with him in private message, but instead I did that openly on his thread so people can decide if he is plagiarizing my design or not. I told him that I wont process this issue further because he said he knows Modex team personally. But they confirming that they dont know this guy so I can take serious action. He just showing another unprofessional behaviour by blackmailing me instead of admitting his mistake and apologize to me

If you think signature design is just a small and not important thing so you dont respect the designers and their design, then this forum is not for you.
What a fucking joke. Working with/for someone like that is almost as bad as doing what he/she did to you. Are there any more "team" accounts that are related to that project? They should be tagged as well. Maybe even the participants of the bounty/campaign.
Get a fucking life Lauda, this has nothing to do with you.
Why the hell would you start tagging bounty participants who have nothing to do with this? It just shows how much of a piece of shit you are.
Go and ruin someone else's campaign or just go back to your mother's basement and keep quiet.
It really is a joke how little scumbags like these who don't want to do any real work so rely on Bounty campaigns on this forum are able to have such a negative impact.