NETSTAR NO STAR

I am unable to believe how difficult it is to terminate my contract with Netstar. I was with them from 2012. Now I sold my car and then called their Offices in Mt. Edgecombe where I fitted the device to find out how must I cancel. I was given 2 email addresses to do so. Cancellationsdesk @netstar.co.za and another to a person Since then no reply in any form. A week later since 14 October since I sent the email, I called the same offices again and spoke to the same person and related my issue. She then transferred me to customer services and the agent took my details down and promised that someone will call me to no avail. My cell contract does not allow me to call 0860 or 0800 numbers. I today 26 October managed to find a land-line number for their customer services and waited 7 minutes for an agent only to be told that he cannot help me and transferred me to the cancelations depot of which I waited for another 8 minutes until my airtime ran out. Now imagine what calling their emergency number would be like. I am receiving my new vehicle next week and I would not connect Netstar.