POOR SERVICE FOR A SIMPLE REQUEST

A call to cancel my device has been cut off, no assistance when i get through to consultant. Then been advised they cant pick up my ID number on a car they have been deducting for 3 full years... how can you claim i dont own the car after 3 years of payments with no arrears? A simple cancellation has turned the company from great service to absolute nightmare and disaster!!!! I need to cancel my unit for a car i sold, how bad can that be? No superiors to speak to on call centre, all i get is case numbers... Absolute disaster! I might need to speak to the whole family to cancel their units as i was the 1 who referred them to you.