bad service ever

I’m very disappointed with Netstar’s service. After installing their tracker, I was given a panic button that doesn’t work. Months later, after repeatedly complaining, they sent an inspector who replaced it with another panic button ,but even now, nothing happens when I press it. I don’t receive any response or call, which completely defeats the purpose. I’m really not feeling safe with this system, and the lack of proper support is unacceptable.