Hello. What firmware are you on? Were you able to fix the problem? I have a similar phone and on version 12.5.4 I could not beat the problem. I can't set my own ringtone, the standard ringtone always ringsI had the same issue with the Mi 11 Pro, the only workaround I could think of was to assign each person a non default ringtone in contacts which worked. If there is a more efficient route I'm all ears!