Well im not sure exactly how you are doing it but here is what I did. The Pogo is set up at my business so I shared a folder with myself through the email option. I got the email that said JHRJ would like to share this with you please click here. I did and the shared folder came right up and I could explore and download all I wanted. So then I forwared the email to my wife and she was able to view and download just fine. So then I logged back in as business owner and Stoped sharing that file. When I went back to my email I could NO longer follow the link it said the files are no longer being shared. Then my wife went to her email and tried to open the forwared invite and it did NOT work either.
So I am not sure of how this has happened to you. But as far as I can tell if you go back and tell pogo to stop sharing that folder nobody should be able to see it or download from it any more.