Mtn should be closed

Mtn stopped debiting me for my contract now im in areas because of them they never communicated with but i still use the same number i have been using for the past 3 years but they have the audacity to call my Friel old mother and scare with thing that she doesn't know i didn't even give them consent to call her. I wanna sue mtn for sharing my personal information with a 3rd party which was not part of the agreement