Hi Debidi,
For help with accessing your ringtone, test the steps for redownloading your purchases below and also found in the article here: Get ringtones, text tones, and alert tones in the iTunes Store on iPhone
"Redownload tones purchased with your Apple ID
If you bought tones on another device, you can download them again.
- Go to Settings
> Sounds & Haptics (on supported models) or Sounds (on other iPhone models). - Below Sounds and Vibration Patterns, tap any sound.
- Tap Download All Purchased Tones. You might not see this option if you already downloaded all the tones that you purchased or if you haven’t purchased any tones."
Once redownloaded you can use the steps here to access your purchase. Use tones and ringtones with your iPhone or iPad
If the issue remains, check your purchase history and report a problem with the steps here: View your purchase history for the App Store, iTunes Store, and other Apple media services
Cheers.