Vodacom FTTH VOIP service not working, bad experience with support and call center

I added a VOIP service to my Vodacom Fibre-to-the-Home. The VOIP service is not working - I can dial out, but when people phone my number it says "the number you have dialed does not exist". I have logged a call with Vodacom (SR***) to get it resolved. The call was CLOSED without fixing the problem or providing any feedback to me. In the closure log that was emailed to me, the only feedback is "Update by Reyaad Soeker: If you need any assistance, please phone customer care on ***, anytime of the day. Please have your reference number ready."

When I phone *** to report that my problem is not resolved they say they cannot re-open the ticket. I was told they will phone me back with feedback from the technician, but I have not been called back. I phoned again and ask to speak to a Supervisor or Manager - they refused and said a Manager will phone me back. Still waiting for the call.