Cartrack is trash

Signing up with Cartrack was the worst decision I've made. After insurance wrote my car off I had to pay a fee to put the unit in my new car it hasn't even been a year and I'm being told my unit is faulty hence I can't see it on my app. Now they want me to pay again for a unit that has never worked. What is the point in paying monthly for 36 months for this is day light *******