Awaiting settlement for the past 3weeks

I had a telkom mobile account which cancelled off in October 2015. I went to the the store to find out what the outstanding balance was and was told that I do not owe anything,I knew this was wrong and called the call center and was told that I do infact owe R2488 which I paid the very next day. Upon applying for finance I was told that I'm listed as a default and bad debt written off on itc. I called the call center agent to request a paid up letter and was told to go to a store upon doing this I was told to call the call center as they don't do it. I have been calling the call center from the 5 December 2015 and have been pushed from pillar t post. All I want is my settlement letter. I have no words for telkom and their poor and distasteful customer service. Had I been a dishonest human being I would of taken the word of the store staff and not paid a cent and left it as is. Telklm agents say today upon calling that the previous agents didn't request a letter from the back office and they just sent a query?? I don't understand as all calls are recorded and it shows that nobody knows what hey doing or they simply just don't care! All I want is my settlement letter and nothing more