Fear not, if the transaction went through then you just need to reset your Play Store app to get it to recognise your order. You do this by reinstalling the Play Store updates.
- Open your device's main Settings app.
- Touch Apps or Application manager (depending on your device, this may be different).
- Touch Google Play Store > Uninstall updates.
- When prompted to change the Play Store app back to the factory version, touch OK.
- Open the Google Play Store app