The thing that happend is that LEVSKI7 was trying constantly finding wrongly displayed odds on our system. And only place bets on this (he is an arbitrage betting user).
When we found out this, we canceled his last bet (before the event was started). He was angry about this, and then started to troll our website.
We paid him many times his withdrawal, but he is not longer welcome as a customer, as he is not a honest gambler and ony looking for holes in the system.