Telkom Installations not honouring THEIR appoint.

I received several sms's from Telkom confirming that my appointment for installation is on the 13th of April 2015 and subsequently rep**** @Yes to all messages. I had to arrange to stay away from work today in order to have someone at home to be here when Telkom arrives for the installation. No one showed up. I have never seen such a disregard for someone's time and planning. What now... how many days am I going to have to put in leave just 'in case' Telkom decide to actually stick to the appointments that they have made? Really... this is unacceptable. I have read another complaint where someone had to wait 3 days and Telkom still did not honor their appointment with him. I am not in a position to do this... I tried phoning the call centre twice but had to hold on for more than 20 minutes with no answer both instances.