Hi I have a similar problem. I upgraded ($120) my dropbox account and kept getting messages that my dropbox was full. After finally getting ahold of a Dropbox rep (no easy task) it was discovered that the account that was upgraded was an email account to which I no longer have access.
I have remained in contact with the rep but still no solution. When I attempt to log in to my old account which was upgraded I get a prompt to chance my password which I cannot do since I no longer have access to the email address so I just get into a loop. Any ideas?
Re: My desktop app isn't linked to an account after I upgraded to a Business plan. What can I do?
If you're still having issues with this, I'd suggest using an incognito window without signing into any account.
When on this page, click on the 'Need help with a billing issue?' button and submit a Help Request from the relevant option at the bottom of the page and input your payment's information along with an email address we can reach you.