Cartrack daylight *******

My name is Mzwandile Wanda. I bought a Mercedes Benz NUZ 36538 (2004 model). I then app**** for a car tracker from Cartrack beginning of this month...because of unforeseen circumstances I had to take my car back to the dealership and get reimbursed. Following that I had to cancel both my insurance and car tracking system. I had no problems with the former but as for Cartrack they are giving me problems.... They say I can't cancel my contract even though I haven't paid any premiums yet and I'm obligated to pay at least R2600 for them to cancel my contract... To me that doesn't make sense since I won't be paying for any services since I don't have a car anymore... So my question to them is what am I paying for?