Unable to make calls from my account

This is more a request for service an an enquiry into MTN’s operation than a review. My ability to make calls has been blocked since Thursday 3 Nov. I contacted their call center, and was informed that MTN had issued me with an incorrect invoice. I was requested to pay the outstanding amount for reconnection. I comp****, and service was restored for a few hours, then terminated again. Since then, I have attempted to contact their call center a number of times. Mostly the call goes dead. I was informed this morning that they had IT problems, and the operator was unable to access my account details. I have tried again now, and the line dropped again. I suspect that the network has MAJOR IT PROBLEMS AT THE MOMENT. Why don’t they issue a statement to the public with an explanation? Why do they call their operators ‘Service Champions’? I find this particularly annoying.