Car track useless service

I signed up with Car track and my debit order went off without a problem. I had to into shosonguwe for work and it was risky, nobody phoned to find out if I was safe or not. Then two months later I got lost in Soweto. My previous tracking company phoned every time I was out of my residential area. Since I stopped my debit order I get numerous phone calls from 7am to late. Even on Sundays. These people never provide a service but they want my money. When they call I just swear at them. I told them I am going to post on Hello Peter but they keep on pestering me.