cartrack has the worst service in the world easily

first of they are extremely rude and they do not want to help .<br> my unit has been faulty for at least 6 months when I called them to come and fix it nothing was done but they keep billing me . then when I order a new unit hey never came to install it and this was 3 months back still the keep taking my money . when I asked it to be cancelled nothing was done had to call again on separate ocations at least 2 weeks apart they said they stopped it but still took my money today when I phone cartrack the lady was so rude she just hung up the phone in my ear still trying to cancel the contract they said the supervisor will call me back this was 2weeks back how can I stop these guys from *****ing my money please help . I called my bank to stop the debit order witch they did but cartrack came back just with a different reference and bluntly took my money can any one please help me to stop this these guys are going to rob me blind.