Displeased at service

I upgraded my home wife a month ago with Telkom, my device was delivered but till this day it has not being installed by Vuma. I get calls from Vuma technicians saying they are at my gate to install yet Vuma has not contacted me to arrange an appointment and I am at work at the time, I keep calling Telkom to enquire and some of their consultants are rude and unhelpful. Why cant Vuma be decent enough to phone me and arrange an appointment so I can ensure I am home or atleast arrange someone to be home at the time. Please rectify this or I will be cancelling this contract .