Recovering deleted files with rm -rf [duplicate]

I accidentally deleted a directory with

rm -rf /media/directory 

When using

ls -lh /media

the space appears to be free, but when I use df or open the file manager nautilus or pantheon, it shows that the previously occupied space is still allocated.

I googled this problem and some says that some process is still using these data, so it won't be freed till unmount, restart or killing the process itself. I did none of these still, is there any way to recover it?