It is a perfectly organized scam. They even have people on these canadavisa forums who reach out to people in private chat and send the contact numbers of the "contact person/ agent" who can get them the slot.I dont think this is scam, what I think is basis my experience (I myself bought a biometric slot for my mother) these people know at exact time when slots are released. They book there and then. VFS being a private and global organisation, I dont think they will do anything like that.