NU Debt Management STOP HARASSING ME !!!!!!!!!!!!

Can Nu Debt Management stop harassing me please , I get numerous phone calls & smses from saying I owe SABC TV licence money , If the SABC feels I owe them they should take me to court with proof that I owe them , I am sick & tired of this harassment now, I have written a number of emails to the SABC stating my case and I have not received any response from them.