Disgusting customer service

I have been waiting more than a month for them to remove the tracking device from my old vehicle and install in my new vehicle. About 20 e-mails and as many calls later and still no response from them. I've requested that they just cancel the contract I have with them but obviously they want me to pay for the remainder of the contract period but I don't even have a tracking device in my car???? I've also stopped payment for August and now for September OH and bet on it they are quick to contact me for payment....not even bothering that DUH I don't have a tracking device in my car!!!!!!!