Cartrack bad service!!!

In the 6 days that i have been with Cartrack i have experienced the following:

1. My tracking device was not installed properly. My car was damaged. And when I requested to fix this. They booked me an appointment and when i got the branch it seems as if the branch had not booked me in. On top of that i was told it would take an hour to fix. But it has taken 3 hours already.

2. My account was debited twice and on my enquiry i was met with a very rude response.

If i cancel my contract due to bad service am i still liable to pay a cancellation fee???