Still paying for a CANCELLED unit!!!!!!!!!

I cancelled my unit with my old vehicle, paid the ridiculous cancellation fee and had a new device installed into my new vehicle. However, you went ahead and still invoiced me for a unit I no longer possess! I have called and called and called with broken promises that the invoice will be credited before the debit order run goes off. It is now the 28th of the month and I am yet to receive any communication regarding this. The level of service you give is a flat ZERO! You didn't even change my contact details after I had informed you NUMEROUSLY that I am divorced and the number you have is my EX HUSBAND. Your consultant Elvis PROMISED that I would receive feedback yesterday, it is now the next day. I would never recommend your company EVER.