In that case it seems the 3/4 equated to $300,000, you can correct me if that number is wrong (and that is the amount you added to the thread). If they did not cancel the 4th bet you would have won over $400,000 but they did cancel it.
In the OP you stated they refunded the $100,000 original bet, just for clarity is that separate from the $100,000 they offered on the condition you were not allowed to withdraw?
There were many open bets, not one. Some of them were 3/4 (see screenshots in the original post). If they didn't cancel them they would have won 400k+