Not arriving at given time and date

Telkom specified a date on which they would come and install our landline. We waited all day, having to take time off of work for this. They did not arrive and no communication was received. They are arrived the following day late in the evening without warning and no one was home. It has now become my responsibility to art out a new installation date with a call centre that keeps you on hold for unacceptable periods of time. For working people this is totally unacceptable. I work a full time job, I do not have time to run around after incompitent people.