Tracker milking customers after Cancellation

Sold My vehicle months ago and they still deduct payments after cancellation. I spoke to Arisha Sewnarian in January to cancell my tracker. Apparently all was fine she sent through the cancellation request and that was the last I heard of her. Tracker still continued to deduct their monthly fees so I blocked the debit order. I received a call from Bohlale Matimolane and was informed in March only that there was a cancellation fee and it cant be cancelled if not payed. I explained to her that this is now the first time tracker contacted me with this information. I said I will pay the cancellation fee but I will not be paying the monthly fee as I did contact them in January to cancel. Long story short I said the that I will pay the fees but she has has closed the email and does not respond. Do not support Tracker as this is apparently nothing new, they try and milk their customers outo of money after cancellation.