Asili Risk Management - no replies to my emails

For over 5 years I have regularly advised SABC that I no longer own a TV and therefore do not need to pay for a TV licence. To no avail! This year SABC handed me over to Asili Risk Management. Despite writing to them 3 times, they just keep sending me an outstanding balance notification, threatening me with legal action. They have never acknowledged receipt of my emails telling them I have not owned a TV in over 5 years. This is extremely frustrating!