No responce from car track

Car track failed to notify me after 4 years that my contract is over , they don't keep in contact with their clients , I upgraded my device and signed up for another 3 years and was told on Tuesday the 7th Nov a new device will be installed it's the 8th and no one has installed come out or contacted me I have taken time off work to accomodate them but they refuse to communicate back . I can't trust this company to safe guard my vehicle if their service is bad like this .