You're essentially asking for a refund on a bet that you started, whether purposefully or by accident. This is equivalent to playing at a live casino, playing single deck blackjack (where sometimes your cards are dealt face down), and then you tell the dealer "nevermind, I didn't look at my cards yet so please retract my bet."
Facts are, just because this is an online casino, shouldn't give users the ability to cancel bets that they started. Some games like Live Roulette, Baccarat, or Blackjack have a timer to allow you to place bets and withdraw the bet. But after that timer is up, it s