Deleting an account I no longer have access to

Question or Issue

I created a Dropbox account years ago using the "log in with Google" feature so I never had to set up a password. That Google account now no longer exists, so I am unable to access my account. Is there a way to delete it? I've already contacted support but they didn't get back to me about the deletion request. I know that if you don't log in in 12 months or so your account will be deleted due to inactivity, but I'm pretty sure that my account has not been accessed in a very long time and despite that I was able to log in a few months ago (when I still had access to the Google account)