I think the entire point is you can't. You are missing proof of access to the account's 2fa email address. Wait the 2 weeks for it to be reset. If you're telling the truth and it's your account, you'll have no issue.

I'm really not sure what else you think you can gain by arguing here. You could probably have a more productive conversation by proposing rule changes to the reset 2fa email system, but now you've effectively forced Daniels hand. If he makes a special exemption for you, he'll establish precedent that will be used by every social engineer'er out there to bypass the standard security procedure.

Your other option, of course, is the legal system. You could speak to a lawyer about compelling Apis N.V. getting a court order for specific action. I am skeptical you can get anything to happen within 2 weeks, but the option for recourse is there if you feel wronged.