Don't they know how to schedule an appointment

Hi, I was supposed to have an existing line installed at a new premises. Everything was fine except that Telkom keeps changing the dates. I scheduled a day that suits me, Telkom decided to change it! As per the sms, I logged on to reschedule the appointment to the 11th- I received the confirmation sms. Today I receive another sms stating the line will be installed on the 9th, half an hour later I receive another sms stating that it will be installed on the 8th. Gosh when are they coming to install the line? I cannot be playing cat and mouse with you Telkom! Needless to say, the consultants on Facebook supposedly seem keen to provide feedback, but it never comes. When are you installing this line as I work and need to know in advance.