Unhappy with Contract renewal

I am quite dissatisfied with the service I have received from Cartrack. I recently sold my old vehicle, which had a Cartrack tracker, and initially requested a removal and re-installation. Later, I decided it would be more practical to start a new contract for my new vehicle rather than pay cancellation fees, given that I plan to keep the new vehicle for longer than the remaining year on the current contract. However, when I proposed this to a customer care representative, she simply stated, "we won’t do that," without understanding my request. When I asked to speak with a supervisor or someone who could assist, she said she would find out but did not follow up. I followed up but I have not received any responses. Additionally, I have not received responses to my emails, despite my prompt replies to threatening messages about blacklisting for a service I no longer use, I had stopped paying because I genuinely wanted to take up a new contract, and it felt unfair that I cannot negotiate with a service provider that for some time, I was happy with and had even considered taking up a new contract. I had requested a call last Friday due to limited phone access, I received no follow-up, only continued email threats.