I had to sell my vehicle due to financial difficulties in January 2024

I had to sell my vehicle due to financial difficulties in January 2024. I app**** and paid for de-installation, as well as, paid for de-installation services. The vehicle was sold from the dealer, and de-installation never took place whilst the vehicle was at the dealer after approximately ten days. Cartracker was informed that the vehicle got sold and that they delayed the process of de-installation. The new owner contacted cartrack for application of services and was informed that someone else's device was in their vehicle. Cartrack informed me that they located the device and will need to de-installed the device and re-install it with my new vehicle. I requested them if they couldn't change ownership within their system and just install a new device for my vehicle. It was refused and said that they need to use said device. The device was only removed mod March and kept in cartrack's possession delaying my re-installation. I only received re-installation of a new device and not my previous device yesterday the 11th April 2024. Finance department is sending me legal documentation of breech of contract of none payments. The more I explained that I'm not going to pay for services whilst my device is not in my vehicle and in your possession, the more they refuse to credit me for the months February and March.