Sabc harassing me over incorrect billing

Good day, The Sabc has chased me for about 2 years now over an annual TV license I do not owe. My account is up to date and the manager has promised 3 times now that he would make a note on my account, this after I had sent proof of payment for the year in question all 3 times by email. I pay my TV license annually and have been endeavoring to do so before the deadlines. I do not know how else to resolve this matter. Worst is, my husband and I are still paying for 2 licenses for 1 household because I am unable to settle this dispute so that we can close one of our accounts. Every few months somebody phones me and not only is it disruptive to my workday but highly distressing because of the bad credit record I am enduring based on the organisation's complete lack of regard.