Lack of service

I have a smartbox telematics device in my vehicle, installed from netstar, Im in the process of selling my car and trying to change ownership of the smartbox to the new owner and having no assistance from either Netstar, or oakhurst. Both parties are pointing fingers at the other, and no one is claiming responsibility or even trying to assist. After spending most of Friday morning on the phone to both companies, i was given an email address to direct my requests to. The email was answered, but only with the telephone number for netstsar. It seems no one knows what's going on.