I ended up with agx.io for now, I canceled all my orders and sent all the coins back into the wallet. I was only one with buy orders there, and still some fake transaction was around me. 
I have buy order on there too.
Nice to know, who nonstop overbidding me there
I wrote to agx.io support, now DCN is offline for trading. But on alcurEX, price is going high, no more cheap buys.
AlcurEX seems fine so far. Needs more volume though! But for more volume you need more people