Cancelled and still being debited

I sent a mail to Netstar as soon as my husbands vehicle was sold for the cancelation. I received a call on the 04th and I was advised to speak to retentions which I did to cancel the netstar. Around the 15 July I contacted netstar and after sitting on the call for 15mins I get disconnected by netstar. The consultant never bothered to call back. On the 29th July I call to find out if it was canceled and I was rudely assisted and the consultant refused to give me her email address for the cancelation to be processed again. I can't continue to call and get no response. I suggest you terminate both the tracking devices and I will find another service provider.