Bad service

I received a call from a gentleman who works at mix telematics last week Tuesday(10/09/2019). This gentleman told me that the device that was installed in my car 3 years ago is not working and it has never worked for the past 3 years. So he will install a new device for that is working which will cost me R150 so I advised that I could not afford that amount so now he offered me cheaper offer of R120 and I told him I could not afford it. Then he told me that I must be aware that I am driving a car that cannot be found when it's lost because the device was not working then he hang up. I was worried so I called customer care to tell what had happened then the lady that I was talking to hung up on me. So I tried again and now I requested to speak to the manager where I was transferred to switch board so the from switch board transfered me back to customer care and I spoke to a supervisor named Thato and I told u my full story, she advised me that she will investigate where the call was coming from and come ba to me the following day. Thato also advised me that the device was working fine and that it has been working for 3 years. The following day instate of getting a call from Thato I get a call from a sales consultant telling me that he was told to call me for an upgrade of my device. So I told him my story and he transferred me to customer service and the lady that I spoke to was so rude I was not in a mood for a fight so I hung up. This company has the worst customer service. From the agent to the supervisor I got no joy at all. I'm still waiting for feedback from the supervisor.