E-mails ignored by Tracker

I have sent the following e-mail plus 4 reminders to Tracker, the 1st time was on 13 October 2015. I have received no response. To completely ignore a customer is unacceptable:<br> <br> \I traded in my previous car and the Tracker contract should have been cancelled with effect from 18 September 2015. There was a Skytrax unit in the car which I did not remove. <br> <br> A new Tracker device has been installed in my new car. I was advised that the monthly subscription is R99.00. It is NOT a Skytrax unit