Netstar poor customer support service

I've app**** online gave my consent for a debit order every month, 2 months go by no debit order try to call asking for if everything is in order, poor customer support, then last week I've received a phone call. I need to pay 3 months outstanding balance end of this month, i sold my vehicle in between trying to get hold of them to remove the tracking device no one will reply to mails or call back after 3 mails and several phone calls to "customer service" can't get through. I would like to cancel my account with them and i don't recommend them.