Cancellation of contract failed

People stay away from Matrix, last year November i sent them email with proof that my car was witten off and mind you i was up to date with payment. But they insisted that i should pay for cancellation fees, I asked them how cos isn't like i'm moving to another car tracker and I've asked them to sent me a proof where I agreed that I'll pay for cancellation fees if ever my car will be written off but they never sent that.they are busy sending email that I own them R1671. Now they want me to make arrangement of paying them and i'm not going to make any arrangements with them since they failed to consider my email. I won't advise any one to take this tracker