Start by sharing your experience about the company, with aim of warning others of the scam. This would give them a bad press. Share this on different platforms. You don't have to go in to details. Soon, your posts will be showing up on Google showing that the company is in the business of scamming people. Let them know that you've started the campaign (nobody likes a bad press)! Next report to the police as that is fraud. Then write them a letter before court action, giving them 14 days to reply. Make sure you've kept all the evidence of the efforts you've made to contact them and get them to settle the matter. If they don't reply to your letter, use the small claims court - Take them to court.
DISCLAIMER - This is not a legal advise. I am just telling you what I would do if I was in your shoes

Unfortunately I have been affected by this scam. I am always careful and I do my due diligence about things like this.
When I was contacted about a domain portfolio I was selling on Flippa by someone who claimed to be Filip Eklund, I thought it was legit. He gave me a Whatsapp number, which had a profile picture on and the number had Sweden code. I then checked out the exchange where he claimed to have transferred  the payment in Bitcoin in to my account. The exchange is a registered company in the UK, and that made me think it could be legit, and also I checked the company out in Company House, and it showed that it was indeed registered in the UK. Having done all of that, I really did think it was genuine. I then proceeded to register with cryptcarbon.com and then made some transfers from my coinbase account, apparently to prove that I own the wallet I would be withdrawing to. Since then I haven't been able to withdraw any of the Bitcoin from the account. They were citing delays in the blockchains.
One of the main positive things is that I haven't transferred the domains, and the other thing is that I am certain that individual or group will face the full force of the law and I will get my Bitcoin back and more. I am already taking legal action against them.
Why am I sharing this? To prevent this happening to any other person. To share my awful experience with cryptcarbon.com exchange. To share the steps I'm taking to get my Bitcoin back, and encourage you if you've been scammed by this company, you can copy the steps I'm taking. The Law is on our side, so people like this will never get away free.

JYA