Billing and client service Nightmare

Phoned into the contact centre Yesterday evening with an account query. Was informed that someone would phone me back, never happened. Phoned this morning to resolve the issue. After 40 min on the call and been sent to 5 different agents at the time, I had to re-explain my problem each time, I asked to speak to a supervisor in the hope that someone empowered would be able to resolve the issue. Was promised to be called back by 09:30 with an update. Call came through at 09:37, at which time I was in a client meeting and could not take the call. Phoned back to the contact centre after my meeting. Could not be transferred to the Supervisor that helped, excuse was that he is in a different call centre and they could not transfer the call there. I left a message to be contacted back. No contact as yet. So, I am no closer to resolution on this issue, yet come the end of this month MTN will be debiting my account with an absorbent amount, caused by MTN's billing system, which I have not budgeted for. Absolutely "Excellent" customer service. So, i have gone through the recommended channels to find resolution, only to be given the run around, thus I will now take my complaint to an open channel, social media, and see how many I can warn about the non existent client service offered by MTN.