Vodacom lack of support

I have been trying since the 3rd of July to resolve a problem with receiving authentication SMS's from our corporate Mimecast system. After speaking with 3 different people and giving up with the call centre I complained on Vodacom's Facebook page and have spent the last 3 days talking online with what seems like different people and now have just been offered a solution that is totally unrelated to the complaint. I have just phoned the call centre back again and spoken with Selina Lepota who has said that she has to call me back as the system is slow. To this time nobody with any technical knowledge has called me and I am incredibly frustrated and shocked at the absolute lack of service from Vodacom.