A reputable company, COPWATCH, goes from hero, to zero

I was called by someone from a call centre to activate an app on my phone from the Copwatch Security company. It sounded like a good idea at the time. I installed the app, but I never activated it and never signed any paperwork to commit to any payment whatsoever. Before I knew it, I was sent outstanding bills!!! For a service and app never even activated! A reputable company just went from hero, to zero in my eyes. They are on a witch hunt for payment of installments of this app I apparently installed, but never even activated!!! How absolute crazy and unacceptable