Can't open Veracrypt container
Hello there, I have no idea how to use hashcat, have downloaded it and tried to understand even with YouTube videos but that all left me still helpless with my problem: on my external HDD I have created a big (90GB) Container encrypt with Veracrypt and I'm pretty sure about what password I have used but now I can't mount that container, get always the message the password is wrong. Have tried some other password but the result is still the same. 
Veracrypt forum can't help and I need so urgently the container's contents which are mostly old videos, really important for me. 
Would be great to get some help. Thank you in advance.