Sending me invoices after cancellation.

In February 2014 a lady phoned me to say I should replace the old tracking device that is fitted on my car. She said that there is no charge, I only had to take my car to a certified fitment centre. In June/July 2014 I got alternative car insurance and they request their own tracking device to be installed. So I let them fit theirs and remove Netstar tracking device and I cancelled my nestar contract. So up until today netstar is sending me an account of R716.04 to be settled even though I cancelled. Now netstar says I could not cancel because when the new tracking device was fitted in Feb I automaticaly agreed to a new contract, which nobody told me so.<br> <br> So thanks netstar for such pathetic lying schemes to keep people bound to idiotic \so called"contracts. And they still send me sms's 1-2 times a week to pay the account!!!!<br> <br> Please clear the account and please stop sending me \""reminders\"" to pay. I settled every cent until the day I cancelled. I am no more a client of yours."""