Refusing to cancel subscription

This morning I called Tracker to cancel my subscription. After holding for more than 10 minutes I finally got through to a call centre agent named Piet Mogale . I asked him to cancel my subscription and after 7 minutes he’s still refused to cancel it. I asked to be transferred to his supervisor he refused and said they can’t help me, I asked him to transfer me to a colleague who will do what I called for because he was failing to do a simple task but he still refused! If there was a negative rating I would definitely give it to them!