Billing only working service

Girlfriend accidentally pressed emergency button, 24 hours later netstar sent an SMS to check if I'm still alive, no call, they then sent me several SMS's over the next few days. On 1 March I emailed their complaint department, no reply. I changed all the batteries and pressed the remote again, no call or SMS. 5 April I cancelled my account. Phoned me about nog getting their number, zero interest about their poor service or why I cancelled. Emailed again on the 19th April, no reply. Asked for a statement when they phoned. After more then 2 weeks they sent an incorrect statement, informed them about the error on the 9th of May, no reply. Still calling trying to get a payment, I'm still trying to get a proper statement. No one that calls seem to be able to do anything. I would definitely not entrust my car or life to them as they are completely useless.