No response from customer service

I received a call from the sales department regarding the warranty of my device. He said the warranty has now come to an end and we need to extend the warranty. I was so frustrated at this point that I went off at him because cartrack is always wanting to up sell things and it gets extremely frustrating. I ended the call. However, when I calmed down, I emailed customer services and asked them whether both my vehicles warranties are up for renewal as I'm confused as to why I'm only receiving a call for the one, the last one I installed, but not for the first one. Now this could have been done in the past but I can't remember. A lady from customer services called me last week Wednesday and she said I have a 3 year contract. At this point I realised she has no idea what I'm speaking about and did not take the time to actually read the email and understand what the client is asking. She said to me she is in Customer service and not sales and cannot see what they have logged on their side. I then said to her, as a customer service representative, you had to fami****ise yourself with what the client is asking and before you call, make sure you have investigated with other teams as well so that when you call the client you know exactly what to say. I then asked her, to investigate which devices are up for renewal and reply to me via email. She has to this day not responded to me. I'm sure you are able to trace who called me and also all calls are recorded, so you are able to retrieve the call and listen in on the conversation. At this point I'm so frustrated with cartrack!