Appalling Service is an under statement

I called the call centre on 11 August @ 08:49 and spoke to Morobo who advised that he is referring my cancellation request to rententions and they will contact me in 48 hours. It is now the 13/08/2015 and I never recd a call. So I waited for the full 48 hours to be up & called and spoke to Brian who wanted to argue the point of the 48 hrs. I asked for a manager and then he states that I need to give them 30 days notice to cancel. Then spoke to Shaun @ 09:24 who states that he will escalate to retentions and it is now 13.42 and I have still not recd a call. My old vehicle was traded on Friday 07/08 and I fetched my new vehicle on 07/08. I need to cancel this contract and find out what they are deciding to charge for cancellation as I have two months left on this contract and i have not recd a call. In the interim my new vehicle is without a tracking unit and should anything happen to my vehicle, I will hold tracker completely liable for anything that may occur, due to that lack of feedback on this matter. This type of service is appalling. I am in a service industry and no way do we deal with our clients in this manner. I want this issue resolved immedaitely.