Poor after sale service

My vehicle began not wanting to start unless I tap on the battery port where the tracker was connected. Which also reset my clocks. Then I asked for the tracker unit to be canceled. I paid the cancelation fee bt still the unit remained active. I was told I have to pay additionally to have the unit removed from my vehicle. What business leaves their equipment after a contract stops.... Makes me question the quality or worth of the equipment. I am currently stuck with my car not wanting to start cos the unit is still not deactivated and I've called in numerous times holding on on my account bt no answer. Tracker has very very very bad after sale service in my experience, but super quick to sign you on.