Being ****** By Tracker

I was told by Tracker that I am going to be paying R219 per month for my tracker, and surprisingly they took R310. I contacted them 3 November 2015 asking them why they are making me pay the amount that I don't know and they couldn't give me an answer. I have been having the tracker for a months now and they have been taking the R310 this is the 2nd time they did that. Their consultants are not even helpful and every time when I call I get a different person. It's the 5th time calling these people and they never help me. I want them to come uninstall the tracker and I am going to reverse the money that they took. I can't be ****** like this. Your Service Is VERY POOR!