Bad service from Cartrack

very bad service. My car (a taxi) tracker unit has been showing the car stationary from the 3rd of September to date. I reported this almost everyday, and they sent out a technician to replace/repair the unit but still the tracker is still showing the car stationary at the same location as before. What is the point of the service if it cannot track the car???? trust me the car is driven everyday the whole day.