I spent my diamonds by accident! Can I get them back?

By adding intuitive confirmation steps, we’ve done everything we can to limit accidental purchases from the game. When making a purchase with Diamonds, you will always be notified, and asked to proceed before spending any actual Diamonds. This has done very well in limiting such instances. 

Because Head Ball 2 is a live, online multiplayer game, reversing changes would have adverse effects on other players you've interacted with. As we can’t turn back anyone's in-game progress, or remove features, providing this refund would put you in a privileged position, which we see as unfair to other players who earned the same item or upgrade through their own Diamonds or gameplay.