Cancellation nightmare

What a miserable experience I had with Tracker. I sold my car (with the tracker) in May 24, I phoned Tracker to cancel, low and behold, 6 months later I see that the debit order is still active. I phoned tracker again, the lady tells me there is no cancellation request on the system and if I need to cancel, I need to pay R2100 cancellation fee (after they already got 6 months of fees out of me after my first cancellation request!) Surely the right thing is to get the 6 months I already paid (not having the car AND CANCELLED!!) discount on this massive insane cancellation fee???