Don't call something a scam if you don't know what happened... Call it a scam when you really understood why you lost your money and you can prove it has been stolen...
Do you have brain issue? or Eye disease?
there are thousands of complaints against these thieves
look at the bittrex ANN topic
https://bitcointalksearch.org/topic/m.24598742
and Scam Accusations forum
https://bitcointalk.org/index.php?board=83.0
https://bitcointalksearch.org/topic/bittrexcom-1000000-disabled-2306630
https://bitcointalksearch.org/topic/bittrex-disabled-locking-more-than-100k-in-assets-2295703