Failed device and 3 missed appointments

<p>I have had a Tracker device for 4 years. A few months ago Tracker notified me that there may be some fault with the device. They have missed 3 appointments with me to install a new device, despite management getting involved with the third appointment</p> <p> </p> <p>This means that I will have wasted 4 hours of my time because of there poor devices / sloppy customer services</p>