MTN worst service provider and provide absolutely no after care service to clients - messed up upgrade by MTN leaving me stranded and cannot make any calls

My contract was upgraded 21 Jan 2022 and since then I have not been able to make any outgoing calls. I am on the MTNSKY package with unlimited calls yet I keep getting the error “insufficient airtime”. I have logged hundreds of calls daily with the customer care Centre, have rebooted the phone numerous times at their request and yet the problem is STILL NOT RESOLVED.

MTN CUSTOMER SERVICE SUCKS!!! There is no available escalation point for desperate clients seeking resolution on issues long outstanding. The excuse of working from home does not cut it. Their CRM logging system clearly does not highlight that I have raised at least 15-20 tickets in just the last 3 days for the same issue. No one gives a damn😡😡😡 I Have tried to reach out in desperation via Twitter but no help either. I have even been into the Norwood store, spoke to the manager requesting their assistance and yet no even they are able to assist or has managed to resolve the issue. The call Centre is not able to transfer a call to technical support either so how does one resolve technical matters clearly at MTN in processing my upgrade??????? So where to from here? Who do we call or escalate the matter to?