Paul, I'm sorry to answer you so late but I also had issues with that. I had to hit support through settings. I myself purchased crystals and it took four days to go through because the game crashed after unlocking my wallet app and using carrier as payment method.
Be prepared to take screenshots and to further expedite any inquiries, create an account on play forum. A lot of issues can be answered there by players and developers regarding in app purchases, bugs, and updates.
I hope to raid your base soon, so keep those alloys and cred stores filled!