Ordered new line - no show for appointment

We ordered a new line, and got an order number.<br> <br> A sms was sent to us telling us that an appointment was scheduled for 2 Sept between 7:30am and 4pm. They had not arrived by 3:30pm, so I called the call center and was told that they would arrive, even if it was at 5:30pm.<br> <br> Big surprise... no one pitched up to do the installation.<br> <br> Then I got another sms today (3 Sept), saying that the appointment is now scheduled for 30 Sept. Your technicians didn't show up for the appointment. We had to make sure there would be someone available to meet them.<br> <br> Now... because of this missed appointment, we have been slotted right back to the end of the queue. How is this customer service?