BAD SERVICE FROM CARTRACK

I have complaint above this company and I will keep on doing so on every media platform. Account number with them is for Mr PR Crous ref number CROU00205. We have sent numerous emails, numerous calls to cartrack regarding the unit that was never fitted to our new vehicle and want us to pay for this NON Exsisting unit. They harrassed us even on Sundays for payment. We have had many fights with them and now we received an sms stating Mr PR Crous have been blacklisted. How can we pay for a unit which was never fitted to our new vehicle. We have got all the emails which was send to them. Come on I WILL NEVER RECOMMEND CARTACK TO ANYBODY. IF THIS IS THE SERVICE THEY PROVIDE I AM GLAD TO BE WITHOUT THEM. I WILL TAKE THIS TO THE NEXT LEVEL AND THAT WILL BE THE CONSUMER BOARD OF SA AND THE OMBUBSMAN.