As it's a substantial sum, I do want to insist a bit more - at least if it's technically feasible for Fireblocks to recover it. Ideally I'd like to put together a detailed explanation how it can be recovered and ask them to relay it to Fireblocks. And I would offer to pay for their troubles.
You can try that by sending them an email and explain your problem. Im doubting they will able to recover your money but it's worth to try. You can only contact them through their email. Is there anyone who can help me with this?
Probably none. Fireblocks is the only party who has direct access to your fund. Good luck with it dude. 
. Because in my experience it causes delays in crediting. indeed some cexes consider it to be user negligence if you have contacted the cex hopefully there is a solution for you. Because it needs validation and information, indeed every cex has different tos, some even apply a minimum deposit that is too high with the same coin and chain but not credited. 
Hopefully deribit can take solutive steps, not a matter of nominal but a form of fairness, rights and care because for whatever reason it is not the exchange's ownership rights. 
