As anybody can see in the mail conversation, they took my winnings frmo 550 mbtc and they only give me the deposit back.
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I can see this answer to your complaint:
Hello Konabel, 
the answer was provided almost a year ago, and is in our signature post since that: https://bitcointalk.org/index.php?topic=5267172.msg56150537#msg56150537
The deposited sum was returned, and the return was confirmed by you. But when your main account received negative trust - you decided to create a new one.
PS. Does supporting such a blatant accuse should cause the same trust rating? Ask yourself next time
the answer was provided almost a year ago, and is in our signature post since that: https://bitcointalk.org/index.php?topic=5267172.msg56150537#msg56150537The deposited sum was returned, and the return was confirmed by you. But when your main account received negative trust - you decided to create a new one.
PS. Does supporting such a blatant accuse should cause the same trust rating? Ask yourself next time
Unfortunately, we don't know what's in the email conversation you supposedly had a year ago.
May I ask why you waited a year to file a claim about this issue?
It seems quite strange that when 1xBit has intensified its marketing campaigns, complaints that were resolved a year ago appear exactly now.