Thanks for suggestion, I edited the title. Eventually I may need to include his username explicitly to avoid further scam victims.
LoyceV deserves more than me coz s/he suggested it and I only backed it up. By the way it's much better

LoyceV (LOL again, seems like you are an expert in this kind of job) has a topic on the Scam Accusations board where s/he exposed scammer
John547s3. I was scammed too by that user. What I did is... I sent same message to several media to make sure that the guy does not get paid for scamming both the company and the BitcoinTalk members.
Read this for idea if you want to. I sent text to their telegram, Facebook, Twitter, email (got that from the admin of their teregram), reddit etc media to make sure somehow my message reaches to the project administrators. Hope this helps. You can keep following up with them until any of their administrators reply you with an acknowledgement.