Tracker being cancelled

I'm so ****ed off with this Tracker Company, What they doing to us is not fair at all and not professional . To start with how do I continue paying for a tracker on a car I no longer own after canceling the tracker I was told that they would stop deducting the amount from our bank and now it's been more than a year and what frustrate me the most is that it went from R192 to R900 and yesterday they took R2000 from the acc tried to stop the debit orders on my bank they debit with different references and amounts .we calling every month only to be told that it is canceled on their side but they continue to debit. I was surprised today to find out I have to pay R1200 for cancelation imagine all those calls and the money that has been debited from our acc went to the drain as I'm no longer using their services what's to be done in such a situation I work hard for this money for them to be debiting anytime they want and not solving my query I want money back