Please check to see if you've been billed and have a receipt from iTunes/Google Play.
*If you've made multiple purchases on the same day, be careful not to get your purchases confused.
If You Have Been Billed
Your purchase was cut off in the middle of being processed. Try restarting your application.
*Closing an app varies by OS.
If You Haven't Been Billed
YYour purchase was canceled before it was processed. No Orbs have been purchased.