Hounding by SABC TV license staff

I turned 70 in April, and as such am supposed to pay R75 per year. I paid R150 to cover two years at Pick 'n Pay on 14 July 2018 and the cashier allocated the money to the account number on the reminder on my cell phone - NOTWITHSTANDING THE FACT THAT THEY WANTED THE FULL AMOUNT FROM ME. That number is * ********** ********** 5. My license number is ********** 17. I am being harassed and hounded by smsses nearly every day, this morning's one citing that I have 24 hours to pay the full amount. There is no particular person to contact - I have sent numerous e-mails and attached the receipt, plus a copy of my ID, as well as my SASSA grant (R840 a month!) because I'm getting interest on a small investment. I am trying to block this "robot" with the seemingly steel finger pressing the same key day after day and sending these rediculous messages to my cell phone. Nobody answers e-mails either, and one wonders: this huge drive to get people to pay license fees, and how active and efficient are the staff there?