Cartrack experience

I bought a brand new fort Figo. Cartrack was the first tracking service to reach out. They came to my location to install the device. A few days later the was something black with black tape hanging from my car. As a female I didn't know what it was so I assumed it was Fort. I work a 12 hour shift 5days in. So I waited for an off day to take my car to the dealer. When I got there they told me that device is not part of the car. Took me a while to know it was my tracking device. I called Cartrack they told me to take it to near by Cartrack office. The is non around were I stay so I asked them to come like they did when installing it. They did not I was calling they would not respond even to emails. This went on for years still paying for my visible tracker. And I then stopped paying . Now they calling me. I asked them please come fix this I'll pay in full what I owe including errors. They made promises I sold the car with the hanging device. They couldn't come to even take it out and I pay them we part ways. Now they are threatening to take me to lawyers I don't even own the car anymore. Please stay away from companies who only want money and have bad service to customers.