Sent to these russians 0.005 bitcoins but never received exchange. Scam.
https://bitmix.biz/en/pages/faqBitcoin:
minimal amount of Bitcoin for mixing is 0.007 per output address
Also it shows on orders page. Also after you sent transaction less than required you'll be notified about it on orders page, did you even try to mix?
Contact us via email/jabber/PM with your order ID and we'll return your coins back.
Regards.
update: we decreased minimal amount and now your order completed.
Problem solved, sent them order id and it was completed.