Cartrack re-installation flop

After weeks of trying to get a re-installation done and 2 or 3 follow up emails, I finally received a scheduled installatin for today at 15:20. No one pitched. I phoned the call centre at about 15:45 and was told that I will receive a call within 5 to 10 minutes. Well, no one phoned back. I've arranged for the vehicle to be available today, now what? Do I need to wait another 3-4 weeks for service?