No Cancellation Done

I sold my car in 2011 and bought a new car. As part of this process I contacted Tracker to move their unit from the old to the new vehicle. They advised me that, since it was an old unit, they will leave the old unit and install a new unit in the new car. BIG MISTAKE !!<br> I have been paying for both units via debit order until I realised this 2 months ago. This is despite my initial communication regarding the sale of my old vehicle, and me sending a cancellation request<br> I have called them and emailed their customer department but to no avail. I am demanding the monies I paid for the \old unit"back<br> """