Tracker keep on debiting me after Cansellation

I had a Honda Jazz and the supplier insisted I should use their special on Tracker Installation and I can get the fitment for free. First mistake nothing in live is for free. I had to sign a 3 year contract. Mistake number 2. I had the car written off in June 2014 but my Tracker contract term was still due and when I phone Tracker I was informed that I still had to pay the remainder of the three year before I can cancel the contract. I did not have the money upfront and decided the contract has to run the full term and I will then cancel it. I phone Tracker in April telling them that I want to cancel the contract and they should not deduct any more premiums. The Tracker agent informed me someone will call me within 24 hours to confirm the cancelation. I phone them on 18 May 2015 after I see they still tried to deduct a premium to confirm the cancellation. Yes says the Tracker agent it cancelled. The next month the same story Tracker want to take my money. I called again. No success. A person from Tracker called me on 25 June 2015 to confirm my cancellation. She confirmed the cancellation and Tracker deduct a premium of R453.00 last night. Money that I really needed.