My name is Kenneth and I am an iTunes Store Advisor. I understand that you didn’t receive your purchased in-app. I am sorry for the inconvenience this has caused but please do not worry, I will get this resolved immediately.
Within 10 business days, 9.99 USD should be posted to the payment method used to make the purchase.
You can try and purchase it again, and if the issue will persists, you may also contact its developer