BAD IS NOT THE WORD!! I WANT OUT

I had my car broken into about two weeks ago,my window was slashed,my car radio taken,my car battery ******,with wires cut,whilst attending to my dismay i missed the call from cartrack,this is 04h30 in the morning. I tried to follow up with Cartrack cause i did not see their missed call,where as they told me that they placed a call to find out about the non activity on the car. My question is,do they only call once,dont they follow up if the client did not answer. What if my car was ******,how would they explain that,is their service as effective as they claim to be,i then tried making contact as i am not happy with the service,how do I rely on a company for poor service delivered,i need to cancel this,where i was told i have signed a 36month contract,am i reliable to pay a service that does not deliver. I have sent numerous emails to their complains department,i have made more than numerous calls to their callcentre,on one call i was teansfered to 17 different people cause none of them could assist with my complaint. Eventually i spoke to a teamleader as a manager was not available,that told me he was going to get back to me in a hours time,its been weeks and i am still waiting,what an i to do,if i dont pay them they react fast,but i havent had anyone communicating back.