I would very strongly suggest you not use cojimenez's suggestion. Or, the utility linked to by kangwankraikal. The utility simply performs the same Terminal command as shown by cojimenez.
This is an undocumented command in Terminal. It's undocumented for a reason. It is known to occasionally destroy NTFS drives. Mounty's own page tells you that, and even suggests using Paragon's or Tuxera's utilities. From their site:
Suddenly all my files disappeared - please help!
This is usually happen when not all files are written properly due to an unmount operation not finishing. The NTFS partition might be marked as "dirty" and the Apple NTFS driver cannot recover from that situation. Mounty will not delete anything by itself, please try to restore your files on a Windows PC using usual recovery s/w, i.e. chkdsk command line utility or professional tools like GetDataBack for Windows. If you do not own any Windows you can use tools for macOS that can deal with NTFS partition maintenance, like Paragon Harddisk Manager or Tuxera Disk Manager.
If you must use NTFS, spend the lousy $20 and get an NTFS driver that is proven to work.