Service Suspended for No Reason

I need to express my extreme frustration and dissatisfaction with the service level we are receiving from MTN at present. This is happening through no doing of myself, it seems to be a system issue on MTN's side and yet our service has been suspended on several occasions since Saturday. I have made several calls to your contact centre as well as the Credit Management area since Saturday and every time the service suspension is lifted only to be affected again later in the day. Yesterday I spend nearly 2 hours of my time holding on to speak to a consultant to try and get this issue resolved. I will not call you helpdesk again because it does not seem to me that there are competent staff at this service centre that are able to resolve the issue. I expect a senior person from MTN to contact me and to provide me with a commitment to have this issue resolved with no further inconvenience to me.