Pathetic customer service!

In March 2019 I traded my vehicle in. I then contacted Tracker to inform them of this and to cancel my contract. Nothing was done, and yet every month their fee was debited from my bank account. In August I recieved a notification email of the increase in tarrifs. This is when I sent them a mail, again notifying Tracker of the issue. The following day I received a phone call from them and again informed them of my cancellation request. Month end the debit order went through again. I am fed up with such poor and pathetic customer service.