Their units not working for me more than once .

I called in to request their tracking unit installed as referred by my friend for peace of mind and their unit was installed about 3 weeks ago. I couldn't call them to trace the position of the vehicle as they hadn't debited me. After the first debit went off on the 2nd of this month I called them to see where the vehicle is and it was confirmed that the unit installed is not working. I was notified that the technician will come and work on it in about 5 days which is not acceptable as my car is not safe at all. The Consultant even confirmed that if my car get ****** by the time is not traceable no one will be held responsible for the loss. Another Technician came in today to reinstall the unit which was done successfully at my work place. He left and I decided to trace the location of my vehicle and I was told that the unit is not working again. My vehicle is still not safe and all the consultant could say was I apologise for inconvenience. I don't see the need of keeping this company to secure my car but my best worry is my money they took for nothing. It is very cruel to me and I'm not used to complain.