By adding intuitive confirmation steps, we’ve done everything we can to limit accidental purchases from being made in the game. When making a purchase with crystals, you will always be asked to proceed before spending any actual crystals. Thus, there should be no "accidental" purchases.
If there was no such a confirmation step, this might have been a bug that you should report to our customer service via e-mail: email@example.com
Please provide your User ID and all necessary account information for us to help you!