How to talk/text with a person for account support?

I have a question that is complex enough that the articles and bots can't address it. I have been in the wilderness for about two years and can't get in to my old email and my phone number is different. I can't get into dropbox because I can't log in to the email the account was associated with and I forgot my password to both. I didn't have backup email. I want to use my credit card statement and the credit card transitions that dropbox billed me to prove that my account is in fact mine. I have a terabyte of priceless photos, videos, recordings and documents on dropbox and I can easily verify that the account is mine. I even have a lawyer who can say that the email address associated with my account, even if I can't log in to it any more, is my email address. I know I should have planned ahead better when I checked out but that ship has sailed. This is the United States, home of service quality, and there has got to be a way that I can prove to dropbox I am me. I will pay what my lapsed subscription would have been for the whole time I was gone, I don't care, I just want to share photos of all my adventures with my grandkids and read poems I wrote a decade ago. So what can I do, how can I talk to a person at dropbox to help me access my account? How can I talk to a manager? Policies exist for a reason and I get that, but I'm obviously me. The credit card on the account was obviously mine. If I keep going up the ladder at dropbox eventually I am going to talk to a problem solver rather than a specialist at saying "I'm sorry sir, there's nothing we can do." The question is how do I find that problem solver. This question is as much for the community as it is for dropbox. Thank you