Bad service and faulty tracker device

Very, very, very bad service from Tacker... Not very helpful at all. Please reconsider becoming a tracker client as I've received the worst service ever!!! The technician installed a device into my vehicle and not once since a month ago did the location update on the tracker app... It still shows the location at the garage where the car was standing before it was sold to me. I've tried numerous times to phone and email and submitting an issue on the tracker app but no one in the last two weeks phoned me. Now they are very quick to send an Invoice for the payment of their device to be done end of this month. I'm furious of this bad service. My car can be ****** and then a month later they still won't know it because of the tracking device not updating the location.