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You are being scammed.
Do not send money!!!
(Any legitimate firm will be able to withhold taxes from your recovery. Any legitimate attorney or firm will be listed both online (have an internet presence) and with their professional licensing association).
Report this to local law enforcement (use their non-emergency phone number), perhaps with multiple reports they will be able to make progress in stopping these kinds of frauds (it is extremely difficult for law enforcement to do so, but if you don't report them, they never will get a chance).
In the meantime, you do not need to take any further calls from this individual. There is no need to talk to him any further.