How do I leave a shared Dropbox folder?

HELP PLEASE:

I had 3 devices listed as linked to my Dropbox Business Account, I actually only had 2

1. My Laptop 
2. My Cell phone
3. My cell phone was listed again?

I was suddenly unable to connect to Dropbox via my cell phone and received this.

I am unable to connect to Dropbox because I'm not connected to the Internet and to try again later

This all the while I was in fact connected to the net and connected via high-speed internet on my router.

I have a voice recorder on my cell and had 800 recordings, suddenly when 

I did re-connect they were gone and so was the file on Dropbox was empty..

Both cell phones had the exact same name but the stated last login on one of them was not me.

I removed links to both cell phones and left my laptop linked and changed passwords everywhere

I looked closer at my Dropbox setup

I had 2 large Dropbox folders, like 65GIG, I was somehow listed as the shared person. I removed myself via the Dropbox website and then all files deleted and then redownloaded themselves and appear fine, WHY?, it was scary and I felt that maybe someone was linked in the background thru my cell phone which is why my access was down for 2-days

THEN after all the adjustments and password changes I thought maybe i am ok....THEN..Sunday, June 14th @ 2pm I received a text that flashed on my cell screen on the bottom of my screen, it quoted verbatim a line from one of the missing recordings, when I clicked on it, the thing disappeared. It was not in logs, it was NO-WHERE...

Any help here is soooo appreciated.....

thanks

Bill Comeau