Tracker company incompetence and defective device

Tracker is world classic poor service. Provider. Received a call to check if i am still satisfied with service from tracker yesterday 29.03.2018 asking me about a car that was sold 5 years ago 2013 as this was not bad. The new tracker was installed on the new car 5 years ago 2013 unfortunately the car was ****** in 2016 and recovered by the police 2 weeks later which i informed the company as i waz still receiving messages from them to say they still looking for the car. 2 years later which is today 30.05.2018 their system still flagged that the car is still ******. Question if the car is ****** what was i paying for the past 2 years? Clearly their device if not working cause for the past 2 years they couldnt pick up the car has been parking at the registered address. No one bothered to contact me to call off the search or question if i say the car is ****** what is it doing at the registered address and update their system. When i asked them about it no answers are given. I fail to understand the security part of this device. Why should consumers pay for system that doesnt exist? Lack of competency from the company is distasteful. When canceling their contract i am told of 30 day period. What am i waiting for as services was never provided from their end in the first place.