Just like small exchanges, we should be careful with Bitcoin mixing services. had it been me, I would only choose from the list of mixers who are partnering with the forum as they are more reputable and trust-worthy compared to others. You should always see and read reviews of the people who already experienced what the specific mixer is offering so you can slash the chance of getting into unsolved problems and at the end lost some funds. I am wishing that soon that mixer will listen and work with you to resolve the issue. Losing assets due to a third-party service provider is always unacceptable.
Yeah, the victim needs to be guided on how to recover their BTC instead of looking for other mixer services on the market. I've never used a cryptomixer, but I think to survive in the market, they must have their own advantages. I hope this is just a small problem and @chekxksfda will be able to resolve it soon when contacting the CryptoMixer team, possibly via the thread on BitcoinTalk.
It would be great if CryptoMixer had a topic on AltcoinsTalks, then they could serve users more effectively. I think President could contact them and make this suggestion, then AltcoinsTalks members would have more signature campaigns and interesting contests to participate in.
From this incident, we can also learn a lot, in addition to choosing reputable mixers in the market, trying to mix a small amount of BTC is also necessary to verify the mixers' service.