Faulty unit NO service from Netstar.

How do you get in touch with anyone at Netstar to assist with a faulty unit ? 3 MONTHS my unit is not working. I am paying a monthly fee for what ? Every time I call in I get told they tested the unit and its testing fine. Every month I get a log book 0km for the month. How the hell ? If my car is ****** or worse hijacked. Who is held responsible ? Can I hold Netstar responsible if some is to happen ? I do my part . I pay my account every month . Do your part and give me the service I am paying for.