Unable to Cancel Tracker – Still Active After 3 Months

I am extremely frustrated with the poor service I have received. I sold my vehicle three months ago and have been trying ever since to cancel the tracking device linked to it. Despite multiple emails sent by both myself and my son, as well as several phone calls, the tracker is still active on the vehicle with the new owner. To this day, I continue receiving alert SMS notifications and phone calls whenever the vehicle enters high-risk areas. This is completely unacceptable. I no longer own the vehicle, yet I am still being contacted as if I do. This situation has caused unnecessary stress and inconvenience. I cannot even sleep peacefully because of the constant alerts. I expect this matter to be resolved urgently and the tracker to be cancelled immediately. The lack of response and action over the past three months is deeply disappointing.