Poor service. Technician assigned but never arrived

I have been calling vodacom about my poor signal which is due to their router. The router previously had a light flickering, which one of the call center agents said it is a good indication that the router functions well.

Now the light isn’t flickering, network horrible and when they call they say it’s working on their side. A technician was appearantly assigned however never came and the call was closed without even asking me.

I tell them I have no consistent signal and I am streaming and they tell me it is fine. Meantime I am paying the full amount for nonsense