Betfury has cancelled open bets that would win ~$400k. They have refunded the value of the initial bets which was ~$100k.
"Would win" is not guaranteed. One wrong result could lose you the whole betslip.
To justify their actions they claim they have a right to cancel any bet and that no bet is deemed valid if it's not finished.
Since it was cancelled before the event finished, their ground is absolutely right and valid. A bookmaker can even void a betslip after the result if they think there were something wrong happened in the match or in your account [In that case we could ask for data].
The risk department has deemed my sportsbook play as high risk and at that point they canceled a bunch of open multiple bets, most of which already had one or more winners (see images of the bets below). Those bets would go on to win over $400k had they not been canceled. Betfury has only refunded the initial bets which amounted to just over $100k. They offered to compensate me with an additional $100k bonus, but I refused.
They were generous to you. Since you refused then the case is closed. Why are you even complaining?