Useless

On the 22nd December 2015 I called Tracker to do a test on whether is their tracking device still working on my car. They told me that they could not find my car cause they were using a low signal and they going to get back at after 3 days. That 3 days passed they only responded on the 28 December 2015 via email just to tell me that they couldn't get response from the tracking device and I must take my to a service technician of which and i must pay a call out charge of R395.00. Today on the 04 January 2016 I called them to cancel my contract with them they said that I must first pay a cancellation fee of R400.00 including the monthly fee. I feel that I shouldn't be paying that amount of money because for all these months I have been paying for a device that not even working on my car. When I told the consultant by the name of Lwazi she refused to cancel because I said that I'm not going to pay that amount. May I please be helped that I don't pay that cancellation fee because for all we know I have been paying for something that is working if my car was to be ****** how would they gonna find it because their device is not working.