I had a tracking device for Cartracker for the past two years in one of my vehicles

I had a tracking device for Cartracker for the past two years in one of my vehicles. I then received a call from carzuka Egent, who was interested in buying my car. I informed him that the car had a Cartracker device and he said that it was not a problem because Cartracker and carzuka were one company. The CEO or owner of the company is one person. He told me that there is no need to continue to pay for the installment. They paid me the money and took the car. Now they called me saying I must pay the device. I said it's okay, but they must bring the device and install it to one of my vehicles. I have been told that the car has been sold to someone. Now, I am receiving calls from arrogant people who don't even want to hear the site of my story. They don't even communicate with their fellow staff members