Empty promises and bad customer service

I wanted to cancel my contract because of bad service for Cartrack and also a faulty device which I was paying for every month. I couldn't get assisted for months. I received a call from cartrack saying they will compensate me by not debiting for the month of October but they actually did debit. And also they haven't refunded me the money they over charged months ago. I getting sick and tired of this back and forth with this company. They keeping on breaking our agreement as per their contract but they are not allowing me to cancel the contract. I WANT OUT!