Tracker-Customer Service non existant.

My boss sold a car 10 years ago, he checked why tracker was still debiting his bank account and found out it was for the car sold 10 years ago. He has had numerous vehicles with tracker and has cancelled each one as it was sold. He is sure he cancelled this one the same as the rest of his vehicles, Tracker says without proof from 10 years ago they will not do anything. He put a stop payment on the D/O so they handed him over for R 1109.65. When I spoke to them and explained that he did not own the car and hadn't for 10 years. Their response was simply prove it or pay up. Krystal Joseph, Title "Customer Service Co-ordinator" said we must prove the vehicle was sold and she would take it to management for review. I got a copy of ownership form from the licence department and emailed the proof to her. Her response was simply we can see it was sold but we have no record of it being cancelled so pay the R1109.65 and we will cancle the contract? They have earned in excess of R 22 000.00 for this car and are not prepared to write off R 1109.65. The onus is on us to prove we cancelled the contract. The previous lady who was employed no longer works here, she would have sent the email, or phoned and there is no way to prove it was stopped. I am completely disgusted with this response, we are not asking for a refund but just refusing to pay any more money after paying so much for something we should not have been charged for. If this is what the "Customer Service Department " is employed for I wouldn't go near Tracker for anything! Dianne