Possessed Ringtone

I have a purchased ringtone that has been my phone ringtone for months on an iPhone 70Plus and now a 10X Max. . 3 days ago it started ringing when there was no call. I changed the phone ringtone and it still rings. I assumed the tone has been tied by accident to a notification and turned the sound off on all. the ghost is still ringing the tone at random and irregular times. Any suggestions that I haven’t already tried? I have done a hard reboot, And if no suggestions can someone tell me how to delete a a ringtone that is possessed? 😀