Netstar is no star!

I installed a netstar nano device during April 2021 in my vehicle I bought in 2021 as instructed by the insurance company to install a tracking device. I used this vehicle as a trade-in when I purchased another vehicle during March 2022. My insurance company again instructed that a tracking device must be installed in the new vehicle. I installed again a netstar nano device after informing netstar that I am using the vehicle purchased in 2021 as a trade-in for the purchasing of the vehicle in 2022. Now I am billed for both vehicles. I am billed for the new vehicle and for the vehicle I do not own anymore. I am sending e-mails requesting for this to be corrected, but no feedback or correspondence from netstar.