That particular command is working for me from my Win10 box…
osmc@kodicave:/mnt$ sudo mount -t cifs "//192.168.254.201/Video" "/mnt/QQ Media" -o rw,iocharset=utf8,username=****,password=****,uid=osmc,gid=osmc,file_mode=0770,dir_mode=0770,vers=3.0
Couldn't chdir to /mnt/QQ Media: No such file or directory
osmc@kodicave:/mnt$ sudo mkdir "/mnt/QQ Media"
osmc@kodicave:/mnt$ sudo mount -t cifs "//192.168.254.201/Video" "/mnt/QQ Media" -o rw,iocharset=utf8,username=****,password=****,uid=osmc,gid=osmc,file_mode=0770,dir_mode=0770,vers=3.0
osmc@kodicave:/mnt$ ls -la /mnt/QQ\ Media/
total 400
drwxrwx--- 2 osmc osmc 4096 Sep 18 15:19 .
drwxr-xr-x 4 root root 4096 Oct 27 13:27 ..
drwxrwx--- 2 osmc osmc 0 Oct 21 07:16 Misc
drwxrwx--- 2 osmc osmc 262144 Oct 24 21:56 Movie
drwxrwx--- 2 osmc osmc 98304 Oct 24 21:56 'Movie 2'
drwxrwx--- 2 osmc osmc 12288 Oct 24 21:56 'Movie 4k'
drwxrwx--- 2 osmc osmc 0 Apr 15 2020 MoviesetArtwork
drwxrwx--- 2 osmc osmc 0 May 13 18:52 'Music Video'
drwxrwx--- 2 osmc osmc 28672 Oct 24 21:56 'TV 2'
drwxrwx--- 2 osmc osmc 0 Oct 24 16:29 'TV 4k'
drwxrwx--- 2 osmc osmc 0 Oct 24 16:29 'TV show'
osmc@kodicave:/mnt$