Unacceptable Netstar!!

During December 2022 I sold a vehicle that was fitted with a Netstar tracking device. I have been trying to cancel the contract since February 2023. Confusion reigns!! I discovered that the vehicle registration number assigned to my contract is incorrect. Multiple calls to the contact centre were made where the agent seems to have no knowledge/sight of prior conversations. Numerous e-mails have been sent, to no avail. I shudder to think what would have happened IF the vehicle was hijacked or ****** during the time when the contract was active. Would they have been able to track or recover the correct vehicle...? What if lives would have been lost? Come on Netstar!! Surely this is not difficult to do?