Definitely a scam. Don't let users or mods convince you otherwise.
Upon hearing that you did not download the LoG Mycryptomixer @ CO. will automatically jump to you having sent the funds to a phishing site.
I'm sorry for your loss, I am going through something similar.

A questions for the MCM people
Why has MCM, if such a legitimate business with so users constantly reporting losses, made no effort in shutting down such phishing sites or at the very least exposing them for users precaution?