Cococarr1959- I've had this problem, too. (After the ringtone app is removed, I still get the tones going off.) I found some of the left over tones scattered all over the Phone.
Some places I found them were: Phone - Music folder, some in the SD Card - Music folder, some in the Phone - Media - Audio - Ringtones folder & some in the Phone - Music Player folder.
I still have one from a long ago deleted ringtone app that shows up when I wish to set a ringtone. I still have not found it on the phone or SD storage (but I have a junky File Manager app).
I don't know if this will help in your situation, but it's worth a try.
Enjoy Today!
Paul