No Customer Feedback

I've received an invoice at the beginning of March 2020 for R1159.67 for a contract I never signed for. I've approached the MTN branch in Mutual Park to assist but they could not do much and request that I phone the MTN Customer Care Service. I contacted Customer Care on the 10th of March 2020 to log a call and request them to escalate the call (ref# ***). They indicate that I'll receive feedback within 24 - 48 hours. On the 17th of March 2020 I still haven't received any feedback. I phoned Customer Care services and they said they have to log another call and escalate it again (ref ***). It is now the 21st of March and still no feedback from MTN. In fact, I've just received another invoice for the amount of R1159.69 for a contract I never signed or never received the device(s).

Surely this cannot be viewed as good service