Netstar still billing for tracking system

Netstar is still billing me for a car that I traded in over 5 years ago. I communicated this to them in 2011 to Mr Shahid Koeries in 2011 and Ms Florence Dikgale in 2013. Ms Glenda August said that I did not follow the correct procedure and therefore feels justified in taking money out of my bank account on a monthly basis for a product and service that I do not use. In principle I find this to be an ********* practice and would expect more ethical behaviour from an organisation like Altron.