Communication with Administration with CARTRAC is impossible.

Once you have a contract with CARTRACK it is impossible to get anything changed. Trying to get my old vehicle off my account and getting the new vehicle on our exiting account seems to be impossible. I just do not get any feedback on my emails to resolve this. It's been more than a month now, I am so fed-up with them. They just do not answer my emails. Do they just renew contracts without the clients consent, and getting them cancelled is impossible? I am very UNHAPPY with CARTRACK!