Trying to cancel contract

After sending an e-mail to different addresses at Netstar( [Email Removed] [Email Removed] and also a lady called Glenda August at the accounts department that deals with this account) and getting NO RESPONSE after e-mails were read, I tried to call the customer services without having any success of the phone being answered, I am still trying to find out HOW TO CANCEL THE CONTRACT as the vehicle was sold.<br> Is it that difficult to inform a customer what the process is?<br> Why should I pay for a tracking system in a vehicle that we no longer own?<br> Come on Netstar! You service is the worst!