STILL PAYING AFTER SUBSCRIPTION WAS CANCELLED

I have cancelled my subscription about a years ago. To this day they still deduct their debit order from my account each month. I've phoned their offices countless times with no success. I don't even own the type of vehicle they have me registered under, and never have. I've been going to the bank each month the reverse the debit order as Netstar cannot even give me a customer number to which they debit off of. I've also tried logging in on their website to see what information they have on me, but the website says that I am not registered with Netstar. ABSOLUTELY TERRIBLE SERVICE!!!!!!!!!!!!!!!!!!!!