i am still waiting for the tracker to be installed

I am much disappointed by the service I have received. the centurion branch was supposed to fit the tracker at my place of residence on Monday the 5th of October and nobody came and I only got a call late Monday from the head office, and was told that the technicians are busy somewhere but I could take it to the fitment centre in centurion and that they will call to give me directions, NOBODY called. Tuesday I get a call from the centurion centre for an appointment for Wednesday and it was set for 10:00 and the technician would come to me. Wednesday when the technician is supposed to come to place I was told he/she cant come to edenvale whish is were I was during the day so we moved the appointment to Friday 08:30. Now its Friday and still I have any tracker fitted what is worse my car was nearly ****** yesterday. I have been calling the Pretoria central branch since we agreed on 14:00 no one is picking up nor is anyone calling me to give me an update. I think I should just get a new company that will take me seriously.