Flippant service and ***** airtime debt imposed on cell number

My Mom’s airtime kept being depleted with MTN first saying she bought auto bundles and then changing and saying she used USSD codes she knows nothing about, all of sudden she owes MTN in excess of R350. We’ve been sent from pillar to post with a useless 135 call centre and a flippant and dismissive agent who said it is what it is. After so many years, thanks for nothing MTN.