Still waiting for a paid up letter!!!!

I paid up my account on the 08.09.2015 and I was advised that a paid up letter would be sent but to date am still waiting. I was told Lefa Letsoalo would send this to me as he authorized my settlement discount but of course that was another lie. CAN SOMEONE PLEASE SEND ME MY LETTER I HAVE PAID YOU. HAD I NOT PAID YOUR COLLECTIONS DEPARTMENT WOULD HAVE BEEN QUICK TO CALL ME AND DEMAND THE MONEY. AM TIRED OF WASTING MY AIRTIME CALLING YOU. SORT THIS OUT!!!!