Bad customer service!

I called netstar to come and change a defective tracker on my car. A new tracker was installed- same range (early warning). Last week I got a call from a lady telling me I had 2 trackers on my account and she told me to call the cancellation department. After many agents receiving my call and dropping on me one of them finally answered, we spoke for 30 minutes where she kept saying I must pay 3000 to cancel the old tracker. I asked her what sane person would have 2 trackers on 1 car. I asked for the old tracker to be fixed not a new account for a new tracker. I just got a debit order for 360 rand instead of R149.00/R199.00. The lady I spoke with on Friday last week around 11:00-12:30 pm promised to call me back but never did. I expect a call to explain why as a customer after explaining over months that the tracker was defective, when it’s actually changed I am now charged for 2 trackers on 1 car!