Device not working and no response

Bought new vehicle 25 April 2013. Told Netstar would arrange installation at CMH. which they did not. Followed up numerous times and sent from pillar to post as supplier liquidated. Installation finally took place end April. Given no documentation or contract and was promised this. Emailed a few times in Mat, still no contract and invoice, just debit order. The device had to be replaced twice as it never worked, requested refund but none given. No response or not even a call from customer service. Have tested the device recently and the panic button still not working. Has only worked once. pushed the button and my wife was called 2 weeks later to check if I was ok. I would like a refund from inception and the device removed as requested numerous times over the phone and email.