They said I need to upgrade account to institutional as they dont allow this trading on individual account ( here comes the scam) so to upgrade I have to deposit 5000$ and agree to new terms, I deposited 5000$ then the upgrade requirement changed to 10,000$.
This was a huge red flag and I am really sorry that you fell for their trick. No legit exchange would ever ask you something like that.
Having said that, I think that you should create a topic about it in
Scam Accusation board where you will provide all the evidence: screenshots of correspondence, you depositing money etc. It is unlikely that you will ever get your money back, but at least we could tag and flag their account and hopefully save someone from doing the same mistake you did.