Help me track down Netstar!!!!

It is very difficult to get hold of this company. I have tried for days and no success, switchboard would put you through but phones keep ringing with no answer. This is a concern of note because if something serious would happen, this mean's I won't be able to make contact with my tracking company. I traded in a vehicle and bought a new one. They still charging me for my old device despite management saying I am excused from paying penalties on the old device. My life with this company has now become a nightmare. The hunt continues with finding the right person or department to speak to.