Cartrack harassing customers when they close they account

South Africans if you Respect your dignity and don't ever want to be harassed and abused by Cartrack, don't ever sign up to cartrack, today every morning cartrack is calling me 7:00am ,even after I paid up their account in full cause I no longer required they services and ended the contract. Now everyday after telling cartrack and their debt collector I paid up my settlement, both are reluctantly harassing me everyday, even thought I received paid up account settlement letter . When I reaise issue with cartrack about telling their debt collectors to stop Harassing me, they say yes I paid them however before I paid them they already handed it to debt collector, yet they acknowledge I paid them. South African use other tracking companies, cartrack is a **** , disrespectful company , all thy are after is money and their have zero customer relations ethic's. Worst customer services I have ever experienced in my life