Not cancelling debit order for faulty tracker removed from vehicle without advising customer that it was removed

The Netstar tracking device I had in my vehicle suddenly became faulty a few days after the 1-year warranty expired. I purchased the device cash and signed up for a month-to-month contract. When Netstar was notified that the device was faulty, they called me to have the device replaced/upgraded. They then wanted me to get into a 3-year contract and I advised that I was not happy and felt I was being ****med. I requested their technician please check on the device to fix it as it may have just required a battery change. The technician then removed the device without telling me. I was notified by my vehicle's service centre that the device was removed, and no other device was put in my vehicle. Netstar did not even have the courtesy to call me to advise of their actions. I had to call them to get confirmation of this. This is unacceptable as my insurance requires me to have a tracking device and removal of this would affect my insurance cover. I then had to urgently contact the insurance company to advise so that my cover was not impacted. Worse still, Netstar didn't notify me of this removal, yet debited my account when they know they were not providing the service given that they had removed the device. I then had to cancel the debit order with my bank seeing that Netstar was not providing the service. What kind of business does Netstar run where they charge customers for a service not rendered. Beware - I would not recommend Netstar. This is totally unacceptable and the worst service I have received from a tracking company.