Dropbox stuck syncing, won't let me delete files

Hello,

My Dropbox is taking forever to sync.

Over a month now I started having issues when syncing shared files. I could manually upload and download the latest version of a shared file via browser, but my files wouldn't sync locally. It took me a while to notice it, so I lost hours of work and had a few arguments with work mates, because I wasn't seeing their edits and they weren't seeing mine. When I finally discovered that my local files weren't up to date, I found the Dropbox app was stuck syncing over 2,500,000 files (it probably was because I moved the location of the root folder of a big project containing millions of files, so I guess Dropbox was having difficulties relocating that many files).

Over a month later, I got sick of having to manually download and upload every single file I wanted to edit, so I cancelled my paid account, and moved to a different company. The thing is, I need to use Dropbox for a few (light) things because it's the platform where I share it with a few others , but even though I moved away almost everything it still says it's syncing over 2,200,000 files, and won't let me sync anything because it says my Dropbox is full.

Long story short: After moving away almost all of the files that I had stored on Dropbox I cancelled my Dropbox Pro account, but it is still syncing millions of files and says I'm using over 4000 % of my free storage. I moved away those files locally, but they continue to appear via browser. When trying to delete them via browser, it says they're too many and asks me to do it locally.

What can I do to delete those files from my Dropbox?

Thanks,

Serafin