NETSTAR wanting to milk money for NO service!! DISGUISTING

I am disgusted at how Netstar wants to milk money out of people with no service. 2018 towards the end of the year, the tracker that was installed in my car was not working. This was during a time when my husband had just relocated from CT to Jozi. I informed Netstar of the issue and beginning of November they came to fix it. We realised that the steering wheel after the technicians worked on it was not properly put in place. And after 2 days the device stopped working again and Netstar was informed for both the steering wheel and the device. The technicians came again to fix the problem. Again within the same month the device stopped working for the 3rd time now. For years I have been a loyal customer with Netstar My husband was new in Joburg, and needed to drive a car that had a working device. I then phoned Netstar to give notice to cancel my policy and asked if they could send the technicians to fix the device again. The lady I spoke to informed me that they can not send technicians if I am cancelling the policy. This was mid month and I had already paid for the service and the device was not working. So basically i was told if i don't cancel then they can send technicians. I refused not to cancel, I cancelled and told her that I will be getting another company to put in a new device and Netstar should not expect me to pay for a device that keeps on breaking down every other 2 days. A new device was installed by another company and worked perfectly fine. I kept on receiving calls from Netstar about payment and they seemed not to know of my cancellation. I requested phone recordings and none of that has been received. And every time a different person calls me I have to tell my story from the beginning. I will not pay anything to Netstar they refused to fix the device when I was cancelling. I cancelled anyway on that same day.