Not providing services

My car went on service on Monday 31/08/15. I called Tracker on 2/09/15 to check if my tracker is still ok, the consultant told me that I should wait for 72 hours to give me feedback. I was not satisfied with that response I went to Tracker's check point, they told me that my tracking device its not and its been a while not working (dead). I got a call from their offices that it must be replaced with an amount of R399.00. I requested them to cancel the tracker because it serves me no purpose the fact that I'm paying the premium monthly and yet they are ***********. If the car was hijacked or missing they would not have assisted me. I called again today 7/09/15 for the follow up on my complain they said I should wait for 7 days now. This annoys me, because Tracker its a vital thing in a car. I just want Tracker out of my system and my bank account. IT IS NOT RELIABLE PERIOD.