Tracker is not reliable

I took over a vehicle with a tracker fitted on Monday 11/4/2015 stating my unit is not operational and were tested on the 10/4/2016 after calling tracker the promised to schedule an technician to call and inspect the vehicle . After calling customer client care i was told the unit is up and running no faults .<br> <br> First how reliable are these tracker units as a friends vehicle were ****** and tracker didn't even know about it! he was on a Skytrax plan .Is this what one can expect from Tracker? <br> <br> At present my insurance wont cover this vechile if and when ****** as the unit is/could be faulty . So are there anyone at Tracker whom can make a decision as i get contradicting results from your company. I find your servces appalling! let me challenge you to see if you can at least call me regarding this unreliable products of yours