Bad service and non-responsiveness

Tracker installed a vehicle tracking device in my vehicle in Jul 13. During Jul and Aug 15 I received notifications from them that my vehicle is stationary. This not being the case I informed them accordingly and was informed that the device might be faulty and needs to be technically inspected. It was indicated that a call would be placed with their technical centre and that I would be contacted for an appointment to be made. This took place on 21 Aug 15. By 4 Sept 15 I've still had no response and phoned them again. Again by 8 Sept still no response and I phoned again to inform them that their service is unacceptable, that they are in breach of contract and that I want to cancel my contract ASP. All the call centre operative could do was to say that my request will be forwarded to the correct department. On the same day I've sent an E Mail to Tracker (Customer Service) and provided the full background to my complaint as well as my intention to cancel the contract. I have received a call from Gear Lock City to do the technical inspection but have told them to stand by till further notice. The only response thus far was an to inform me that my E Mail was forwarded.