Help Change Contact Back to "Default" Ringtone

[hiiisociety]

I've search and tried everything and nothing works to "reset" my contact from custom ringtone back to following the default ringtone profile.

Tried setting the ringtone to match the default but it still list it as a custom.

Does anyone have a solution for this or successfully changed a contact to a custom ringtone then back to "default"?

Thanks in advance for your help.
J