Can not delete all files i my webhotel

When I will delete all my drupal files on my webhotel (oneeuro.com) I always have two files back and this is default.settings.php and settings.php

On my dreamwaever log I get this message:

/public_html/test/sites/default/default.settings.php - error occurred - An FTP error occurred - cannot delete remote file default.settings.php. Access denied. The file may not exist, or there could be a permission problem. Make sure you have proper authorization on the server and the server is properly configured.

I have try to set the permission to totaly open whit 777, but it don't help me.

What did I do wrong?

Xbobby