Normally, orders are delivered instantly, but there might be occasional delays due to ongoing processing. In such cases, rest assured that your purchase is still being processed, and there's no need to attempt buying the same pack again - it will arrive shortly!
If you haven't received your purchased item, please get in touch with Apple Support, as all payments made for the game are processed by Apple. You can contact them directly using this link. They'll be glad to assist you with any payment-related inquiries.