Request for refund for De/Re-installation that did not take place

I sold my car December 2025 unfortunately when technician had to go get the device, the car was already sold from the dealership. I did payment arrangement for the De/Re-installation but I called and also emailed the consultant to cancelled it since I will proceed to pay for the old device and took a new contract meaning I am now paying for 2 devices. The debit order for the cancelled De/Re-installation arrangement went on. Every time I call there is no way forward from the consultants to a point of being told that Cartrack does not owe me.

Why do you debit for a service that you did render to me?