Poor service MWeb

I have been trying for over a week to sort out my VoIP connection on Mweb fibre after advising the technical department that I could not hear any audio from either side. I've been waiting for someone to get back to me to solve this problem. MWEB advertise that you can save on a fixed phone line by taking their MWEB talk service. It appears to me that they do not have the technical expertise to solve problems on this service. I also have a problem with being pushed from pillar to post when trying to get help on the technical support. I keep getting referred to other departments which is accompanied by long holding times on the telephone and complete frustration. I tried to look for a complaint line on the website but to no avail. I'm also irritated by the increase I got at the start of the year, citing an increase they got from Vumatel, implying that this increase was unavoidable. I don't accept this. They are business partners with Vumatel and hence can apply pressure to them to keep their prices down they used the same tactic when I was on Asdl, stating that Telkom was the problem, even after they took over the rental for these fixed lines. They take no responsibility though I was paying them directly for the line rental.