Hi there, karie108.
I see that you're trying to purchase a ringtone you'd like to use on your iPhone. The problem is, you've had to purchase it twice, but the ringtones hasn't appeared on your phone. I'm glad to help with this.
Use tones and ringtones with your iPhone, iPad, or iPod touch -- See if you're able to redownload the ringtone. The steps are under the section titled, "Redownload tones that you purchased with your Apple ID".
See your purchase history in the App Store or iTunes Store -- Make sure you're seeing where you downloaded the same ringtone twice.
Request a refund for an App Store or iTunes Store purchase -- If you see two charges for the same ringtone, this article provides the information and steps that you need to request a refund for the charges.
Take care.