Cartrack harassing me with non-stop calls and e-mails

DO NOT HAVE CARTRACK INSTALLED IN YOU CAR, HORRIBLE HORRIBLE HORIBBLE SERVICE. This organization is very disorganized and draining.. I have been getting non stop calls and e-mails from them even after I told them their account was paid and upto date by the dealership. They keep on making excuses of: there is a system glitch, it is not my problem. I am sick and tired of you guys and your services.