I made an account for a similar matter. Kncminer are scammers, as soon as they have your money they don't want to know you. They have blocked my phone number and my emails (both were confirmed by third parties).
I purchased hosting around a month ago and I am STILL awaiting my refund while I watch the BTC price skyrocket. Because I paid in BTC (12.9), I was going to turn the USD refund (even though I should receive BTC back) back into BTC. Now I am looking at getting HALF of my refund back due to kncminer's lack of interest for my refund. They are obviously just riding the price up so they can give back as little as possible.
This is a nightmare! Anyone who would feel angry at losing thousands due to a company vanishing on them would be pissed off. I will be posting my own thread in the next 24 hours with EVERYTHING.
I will not stop until kncminer is brought before the courts and convicted. To the OP, I want to be part of your complaint. I have already called the Stockholm police and 'Scam watch' who have both recommended the AFP to launch a formal investigation. My Government has a huge interest in scammers.