Cartrack totally unprofessional

I have been with Cartrack for a couple of years now. My first problem came when I was in an accident and with my car being at the panel beaters my battery went flat. I received my car back and after a couple of weeks tried to locate my car on the Cartract app. I then realized that my Cartrack was not working and they said that my tracker failed some time ago and needed to be replaced. I had to pay for a new device and this increased my monthly premium although it was their device that failed, I paid for several months for a device that was out of order as they could pinpoint the date the unit failed. I went on pension and arranged with Cartrack that I would not be receiving any income and to cancel my account till further notice. However, they kept on debiting my account after arrangement and I received one maybe two calls daily whereby I had to explain my situation over and over again and they said that they could see an arrangement was made. With all the debit orders made in this month alone, I am in debt for over R700 after I arranged with Cartrack. Cartrack, please come and remove your unit as your actions is totally unprofessional and I wish to cancel my contract