Sorry to hear about your treatment by these scammers, Your story is the exact same story as all others I have been reading about for the last ten years, it is the same method that these scammers use under different names and new fake company/names over and over again.
You may have already have done a search on Google for other reviews but here are some links I found on first page I opened
https://brokerdispute.com/#how-it-work, The first time I have seen this site but it seems that they help in cases like yours, have a read through the website and see if they can be of any help.
https://www.payback-ltd.com/retrieval/ This is another site, again this is the first time that I have come across these kind of services being advertised on-line so be very careful, you cannot trust anyone or any service on the net now days or at any time to be realistic, do some due diligence before handing over a cent to anyone you cannot meet in person, the Internet is infested with scammers of all sorts
https://ie.trustpilot.com/review/kayafx.com On this site I see that some people claim to have gotten back their money with the help of a certain Marcfinley that seems to be posted in the reviews, but to me something seems a bit fishy the way he seems to be advertising his email address within the trustpilot reviews, tread carefully here, may be legitimate but who knows.
Hope you have success with the return of your funds,
P.S. When you had so much money to deposit I cannot understand why you would go down the unregulated binaryoption/cfd/forex route and not a regulated USA based Futures/commodities/Options CTA (commodities trading adviser) investment firm, but I hope you understand that all investments carry substantial risk, there is no guarantees of return in this business.
Thank you for coming up and comment. I appreciate.