My Dropbox has an unused team in it & I can't use my own account

I am a filmmaker.  My Dropbox was used a couple of years ago by a co-worker on a project I am no longer connected to.  He created a Team in my Dropbox.  I was able to remove all the files from that Team but I cannot remove the Team folder.  This Team is no longer used by anyone.  It seems he is the only person with access to that Team folder, the only person who can delete it because he is the Admin for it because he created it.  It's in MY Dropbox account and I no longer have any way to contact him.  I tried to open a new Dropbox account but it wouldn't let me because my email is already used on my old Dropbox account.  How can I regain full access to MY Dropbox so I can use it?  How can I remove that no longer used Team Folder from MY Dropbox?  Is there any way to contact a live person at Dropbox to help me with this?  All I can find is the Community Support (here) and the totally useless Chatbot.  This is a major problem for me.  I only have ONE email address and I don't want to have to log on to different email accounts to see MY Dropbox.  Help, please!  I am extremely stressed out over this situation.  I upgraded my account to a paid account but it did not make any difference.