Bad customer service for device installation

Carrack has a new dash cam offering. I was pleased when they called and offered it to me at a discount. A separate consultant then called to schedule an appointment. We agree on an appointment on a Thursday a week later at 8:00 specifically. After the scheduling I recieved an sms informing me my appointment was scheduled for the Thursday I done the booking not next week at 8:00 am in the past. I called Carrack to alert them of the sms and was informed that I can ignore the sms in the system all was well. On the day of the installation I received an sms informing me the time was no longer specific but had moved to a range from 09:00 to 16:00 hrs. Indeed the technician did not come through at the agreed upon time so I called Cartrack who informed me the technician allocated was no longer available and they had rescheduled without engaging me directly. This is very unprofessional when they had scheduled for a specific time they rescheduled for a time range on their own without engaging the client directly. Cartrack basically assumed I was available to wait all day, when on initial engagement a specific time had been agreed. The product sounds good, the discount was nice but the service is bad.