Waiting forever for a simple line installation.

On the 3rd of May I received an sms notification from Telkom confirming my appointment for the 4th of May for a line installation. I made special arrangements to be at home as the sms states that it is a whole day installation. At 09:00am I gave them a call to try and find out what time the technician will arrive. The call centre was unable to get hold of the technician and promised to keep trying and phone me back once they have feedback. At 14:00 I phoned them again to follow up, this time they said the installation is only scheduled for the 13th of May! No one has the courtesy to get back to you to tell you what is going on and after speaking to a supervisor who promised me they will resolve the matter, I still have not had any feedback! Pathetic! It has been more than 2 months now that I am waiting for this!