TRACKER CANCELLATION ISSUES - NO RESPONSE

I have contacted Tracker numerous times to inform you that we no longer require the tracker service as the vehicle was sold over 3 years ago. As the my father and I no longer live in South Africa, we have only now realised from his bank statements that this account was still active after all these years and we are paying for someone else vehicle tracking!! Tracker is giving us the run around and requesting we call, which we did. They requested an overseas number to contact which we have provided, still no contact as to the cancellation of this contract. This is uterly un ethical and we as the previous owners should not be paying for this. if this account is not closed immediately, we will be seeking legal advise to ensure this matter is dealt with.