cartrack tracking your money

i wrtoe about two weeks ago about my experiece with cartrack. after they phoned me i explained to them that i am not satisfied with the pro rata amount for 9 days that is almost the same as a whole month. they said they will call back that i havent recieved a call back. this after noon a lady from cartrack with a very agressive tone told me we owe them money and the more i explained to her we have cancelled and are finished paying the more she insisted i owe them money with a tone that i dont like very much. im done with telemarketers the next time somebody calls me to sell something i will just hang up. you always have problems and the onus lies on you you call back and sort things. im done