4 times no-show- is this acceptable?

My husband has been trying to schedule installation of a Telkom line for over a month. Week on week, the planned installer fails to show up. Yesterday, my husband phoned and requested the name of the installer. When he answered his phone, he responded that he was on leave that day, even though Telkom had scheduled him to attend to our installation. Again today my husband was promised service but we were disappointed once again (4th or 5th time now, I'm not sure, I've lost track). This is hugely frustrating and we are thinking of cutting our losses and going another route.