Only the security team could provide you with detailed information about account closure.
In addition, you were accused in multi-accounting here on bitcointalk, not at 1xBit.  

From our side we see this situation as fulfilled:
- Just like it said in the ToS - a player consent to follow them once he places a bet on the site (this is a written contract).
- Due to the ToS, the company reserves the right to stop cooperation with any player without explanation, but with a refund provided.
- You processed a withdrawal once your account was re-opened and the refunded sum was available for withdrawal.

It could have sound like a scam in case there weren't proofs of payments made out from the site with the way greater sums. These proofs in our signature post, and in the review thread.
We can say for sure that you weren't banned for winning, but for not following the ToS.

This could be easily proved wrong if you check how much instruments are used on this forum - contests, design work, management, reward sending right to the accounts, betslip checks and cases resolving - all this can't be done by a single person or an affiliate.

But that could be proved even easier: https://bitcointalk.org/index.php?topic=5266815.msg54944167#msg54944167 + https://bitcointalk.org/index.php?topic=5267172.msg56313435#msg56313435

Sincerely,
1xBit team